envii Pond Klear – Green Pond Water Beneficial Bacteria Treatment Improves Water Clarity Down To 4°C – Treats Up To 20,000 Litres


Clear your pond. Look After Your Planet. Envii Pond Treatments and Envii Logo GraphicPond klear pond bacteria treatmentMulti purpose pond cleaner, clears water, reduces sludge, prevents algae graphicFish, Pet and Wildlife Friendly GraphicClears cloudy and murky pond waterPond Klear keeps ponds clean and healthyClears cloudy and murky pond waterPond Klear keeps ponds clean and healthy

Cleans Ponds

Pond KlearPond Klear XtraSludge KlearAlgae Klear XtraPond EqualiserBlanketweed Klear
Treats Upto 20,000 Litres Up To 60,000 Litres Up To 60,000 Litres Up To 20,000 Litres Up To 7,500 Litres Up To 40,000 Litres
Clears Murky Water ✓ ✓ ✓
Clears Green Water ✓ ✓ ✓ ✓
Maintains Healthy Pond ✓ ✓ ✓ ✓
Digests Sludge ✓
Stabilises pH ✓
Safe For Fish ✓ ✓ ✓ ✓ ✓ ✓


Weight: 1.08 kg
Dimensions: 25.3 x 11 x 8.1 cm; 1.08 Kilograms
Brand: Envii
Dimensions: 25.3 x 11 x 8.1 cm; 1.08 Kilograms

89 Responses

  1. Anonymous says:

     United Kingdom

    I will admit to being a little sceptical about using this. I have done so before but hadn’t appreciated, until this year, just how good this product is.
    My pond had turned to a very beautiful shade of green. It looked as though it would fluoresce at nighttime! Never had the problem to this degree before and after a few months, with the heat this year, it was just getting worse. Couldn’t see anything beyond 1cm of depth. No fish – no plants – nothing!
    Eventually, more out of sympathy for the fish than anything else, I decided to try this product and so, a couple of weeks ago, I tried this Pond Klear. At first, nothing seemed to happen. Then, I noticed that the green colour had gone. Finally, today, the water is so clear I can see the bottom of the pond and all the fish.
    I am absolutely delighted and recommend this to anyone.
    (Only one negative, and since I can’t blame anyone, I won’t. When I received the bottle, the sealing cap had leaked. The box it came in was wet, and I guess I’d lost around 10 to 20% – hard to be accurate. However, it still worked!)

  2. Anonymous says:

     United Kingdom

    I was a little sceptical about using this but read the reviews and thought I’d give it ago.
    As it says, it’s not an over night fix but give it time and it really does work. My pond is now very clear and my fish seem a lot happier.

  3. TXDJuneuqh says:

     United Kingdom

    This is amazing. Tried other brands with no success. You may think this is not working but it does say leave after first application , as it takes a few weeks to work. And it does..it really works.

  4. [email protected] Annette Anderson says:

     United Kingdom

    Bought this product as my new garden wildlife pond became very murky during the hot weather. Added small amount of the product three times in a watering can of rainwater over a period of ten days. Over the last three days the water has cleared and is now as clear as the day the pond was originally filled. We have a very basic filter system.

  5. MWSG Admin says:

     United Kingdom 🇬🇧

    Excellent treatment, perfect results.

  6. TomElishauibt says:

     United Kingdom 🇬🇧

    Still using it – as it is a long term application.

  7. Anonymous says:

     United Kingdom

    I recently redesigned my pond and put in a new liner. With all the upheaval it made my pond very murky. I purchased the pond clear extra and went a bit over the top on the amount I required. My pond is 3ft 9at it’s deepest and I estimate 2,000 gallons. I administered the correct dose and thought I can always add more if I need it. 3 days later it was gin clear . Brilliant product.

    It really works well

  8. Anonymous says:

     United Kingdom 🇬🇧

    Hopefully it’ll clear the duckweed that ruins our garden pond

  9. Anonymous says:

     United Kingdom 🇬🇧

    Really easy to use and works really really well and doesn’t affect fish or wildlife I highly recommend i

  10. Anonymous says:

     United Kingdom

    Golden Review Award: 2 From Our UsersI was not over-sanguine about this product, indeed the instructions tended to re-inforce my cynicism (if it doesn’t work, keep buying it until it does). It is a weekly treatment. First three-weeks: no change. (Snake oil, anyone?) Fourth week: I wasn’t too sure, maybe I was just imagining the improvement. Fifth week: within 48 hours, the entire pond went from opaque green to crystal clear; I can now see to the bottom of the pond at its greatest depth (three feet). This treatment would therefore appear to be some kind of biochemical titration. Keep going until you get to the tipping point, at which the algal population suddenly collapses.

  11. Anonymous says:

     United Kingdom 🇬🇧

    I ordered a litre bottle for approx. 29, so why was a 500 ml bottle substituted at a cost of approx 20? Can’t be bothered to return but not happy!!

  12. Anonymous says:

     United Kingdom 🇬🇧

    It is a slow process but after a month we are seeing good results we can now see our fish

  13. ElouiseBanuelos says:

     United Kingdom 🇬🇧

    Recently used for the first time in my small feature pond, (no fish), appears to have kept the green algae at bay! I dont have to clean the pond quite as often!

  14. aley says:

     United Kingdom 🇬🇧

    Early days, but already making progress at clearing the pond water.

  15. DerekMcbee says:

     United Kingdom 🇬🇧

    This product takes a little time to work but clears the pond very efficiently. Important to follow the instructions.

  16. Anonymous says:

     United Kingdom 🇬🇧

    Great product worth every penny,
    Cleared my pond in 6 days.

  17. Jocelynessentia says:

     United Kingdom 🇬🇧

    My garden Koi pond was pretty murky and not clearing this year. 1 week post first treatment with this product it was much improved. After a second application it was soon crystal clear.

  18. Anonymous says:

     United Kingdom 🇬🇧

    Really works well, you have to remember this is not a quick fix! It will take a few weeks. Add it every few days and keep cleaning your filters and the results will be crystal clear water in a few weeks.

  19. DamonYYQxyx says:

     United Kingdom 🇬🇧

    Did’nt know what to think about this product, the instructions said 25mm per 1000 liter but I double dosed it, after 24hrs, the transformation was amazing I could see my fish and they came to the top for feeding, I’ll certainly be buying again.

  20. EdenPaspalis says:

     United Kingdom 🇬🇧

    This is my second bottle of Pond Klear. I have a natural pond with no pump and this clears the water perfectly. I tried the powder one specifically for natural ponds and that didn’t do anything. One dose of this clears the green water within 3-4 days and keeps it clear for a couple of weeks. I love that it’s safe enough that my dogs can drink from the pond! I just need a lifetime supply now!

  21. Anonymous says:

     United Kingdom 🇬🇧

    This pond clearer is the best I have ever used, I tried all the popular brands since early spring to clear my pea soup pond of algae but nothing happened. I put the suggested dose of Envii pond klear in a week ago and day by day it has cleared to what is now a crystal clear pond. I can see all the baby fish I never new I had and see all my plants growing. Give it a try but give it time to work, not instant but does the job perfectly, highly recommended.

    Best pond clearer I have used. Brilliant.

  22. Anonymous says:

     United Kingdom

    I used 3/4 of the bottle for a 4000 litre koi pond every 2-3 weeks. The water eventually cleared but I also had to clean the filter twice during this time before the water showed any significant improveme

  23. Anonymous says:

     United Kingdom 🇬🇧

    my pond had gone a thick browny green soup. I could not even see the fish. I replaced the UV bulb in the filter and reduced some of the water putting in fresh, but not much improvement. Bought and used Pond Klearand after about 4 days the problem is almost gone.

  24. RickeyCundiff says:

     United Kingdom 🇬🇧

    Took a time but pond clearing at last. Easy to use. Reasonably priced. Recommended.

  25. ErnieWindham says:

     United Kingdom

    I’ve had this bottle sitting in my shed for nearly a year and never used it despite my pond always looking murky, however I decided to give it a go about 6 days ago and already I can see improvements! In fact for the 1st time in a long time with the right light I can actually see to the bottom of my pond! I did clean my filter out before I used it as instructed and I’m sure that has helped but I clean the filter out at least once a month anyway without it making any real difference to the water quality so I can only assume its to do with this magical liquid! Highly recommend it and I’m hoping my pond just continues to get clearer!

  26. Hitting the Sauce says:

     United Kingdom 🇬🇧

    This is my 3rd bottle.
    I use it for my frog pond and my water well.
    Used regularly it’s good. No good on really dirty water.
    Its good that its not harmful to animals as we have a dog who likes to drink from the pond when our backs are turned.
    I would reccomend.

  27. Anonymous says:

     United Kingdom 🇬🇧

    Been having issues with cloudy water in my pond. Used as per instructions and within 48 hours I have a clear pond again. Easy to use, simple instructions. Needs to be used regularly and does mean the filters need cleaning more often but well worth the effo

  28. SallyBarrington says:

     United Kingdom

    In been using it just over a week now but i am finding that the water is still green ,I have used other products
    And a change with in a couple of days so I am a dit disappointed.

  29. Anonymous says:

     United Kingdom 🇬🇧

    easy to use seems to be doing the job will not see results for a week or two

  30. KittyRouse says:

     United Kingdom 🇬🇧

    Its helped a little but my pind is still quite green maybe going into autumn will help

  31. Anonymous says:

     United Kingdom 🇬🇧

    Easy to use and excellent delivery . Does a good job and noticed a difference first time I used i

  32. Anonymous says:

     United Kingdom 🇬🇧

    Item as described. Fast delivery. Have used it but too early yet to establish how effective it is. Time will tell.

  33. Anonymous says:

     United Kingdom

    I can’t believe what this bottle of magic has done for my pond! Be aware that it doesn’t work overnight. You need to be patient and keep adding it at regular intervals. It took about 3 weeks to clear my murky pond. But now the water is crystal clear! You can actually see it working if you look closely at the water. There’s literally no algae in my pond, even the white stones are white! I have reordered another bottle.

  34. MilanESSlncrgy says:

     United Kingdom 🇬🇧

    We put this in the pond last week and already are seeing a difference. We’re cleaning the filters every 2-3 days and they are extremely dirty each time, which shows the product is working. We hope it continues to be so effective.

  35. Anonymous says:

     United Kingdom 🇬🇧

    Not sure this is working on my solar fountain. Water had remained green after a week so I just cleaned it myself. I’ll keep using it to see if it was just due to the extreme hot weather.

  36. Tom Caughlan says:

     United Kingdom 🇬🇧

    I have been trying to clear green water from my pond for months. ( The weather hasn’t helped.) I have tried various products. Envi pond clear has done the job.The instructions said you could use a double dose, so I did. It needed several doses over a few weeks for it to work but at last I can see the bottom of my pond again. Good stuff.

  37. Anonymous says:

     United Kingdom

    Have used it before and it clears my pond within a week or so

  38. MarylouSells says:

     United Kingdom 🇬🇧

    Product has cleared an extremely murky pond,but it is not a quick fix.Have used weekly for 5weeks and am happy with the results.I chose this slower option as there was no detrimental effects on the fish

  39. Anonymous says:

     United Kingdom 🇬🇧

    Took one amount which didn’t make much difference to my green pond but a week later another amount cleared the pond within a couple of hours

  40. EstellaCrump says:

     United Kingdom 🇬🇧

    Started using this product in hopes of bringing my 10 000 l filtered pond with fish into a healthy shape … Started to see difference within 6 days .. week 2 pond clearing very well can now enjoy the fish which have not been effected at all … In fact since starting treatment fish have become lot more active and are mating …. Easy to use … Instructions are very clear , once you know the size of pond it’s easy to work out how much to use … Very happy with product overall 5***** ……week 3 … Omg my pond is like looking through windows my fish are enjoying pond . Cleaned filter and tbh they weren’t that bad . I’m that impressed I’ve just bought another bottle … For future use if needed….I do recommend to those who are not finding this to work . Give your pond good clean .refresh water and add as a preventative as it helps mature pond safely but speedily …..

  41. Anonymous says:

     United Kingdom

    Given 4 stars for prompt delivery and excellent measure on bottle to give accurate amount needed. Easy to work out proportion of Pond Klear required to amount of water in pond. I scooped out a bucketful of water then mixed in Pond Klear and their tip was use a watering can, so transferred from bucket to can, then poured evenly onto pond. As instructions state, don’t expect overnight clear water, although fish seem more active already and water does not look so cloudy. Downside. Didn’t want to join Amazon Prime so had to pay postage!

  42. VaughnStubblefi says:

     United Kingdom 🇬🇧

    It’s not instant, but 3 weeks on and my pond water is noticeably clearer then before. Happy with the way it has worked, instructions are easy to follow, I can see the extra gunk being caught by the sponge element of the filter and I have cleaned these each time I redose the pond. In a nutshell takes a few weeks to work but it does work, I would buy again happily.

  43. Anonymous says:

     United Kingdom

    I’ve been waiting a while to review this product for obvious reasons. I started off with horrible, thick, green water with perhaps an inch depth of visibility. I’m a couple of days away from administering the fourth dosing and I can see the bottom of the pond clearly (about 2 1/2 feet deep). I started off with the pond equaliser as suggested and then followed up with the Pond Klear a day later. I didn’t see any change for the first week or so but after that the improvement in clarity was visible day by day. I’m having to wash out my pond filter every day now because so much stuff is being pumped through. I look forward to seeing even more improvement as the weeks go by.

  44. BVVJaninawbf says:

     United Kingdom 🇬🇧

    I am old and the bottle is hard to push liquid through to opening

  45. Anonymous says:

     United Kingdom 🇬🇧

    I purchased same product last year. It is easy to use with good clear instructions. The water in the pond was very murky/green but after four weeks of treatment the water started to clear. I continued treatment until beginning of Autumn, as water was crystal clear and has remained so all Winter. I will recommence treatment during the Summer months.

  46. GeorgettaTilley says:

     United Kingdom 🇬🇧

    Easy to follow instructions. Too early to say if it works.

  47. Anonymous says:

     United Kingdom 🇬🇧

    Despite a fountain and all the right plants my new pond was getting greener and greener. I added half a bottle of this and within a month or so the water was crystal clear. Unfortunately, the clear water resulted in the goldfish being taken by the local heron, but at least now I can stare into the pond and admire how badly I formed the creases in my butyl liner!

  48. Fabian98Kgoubyn says:

     United Kingdom 🇬🇧

    Didn’t do a great job for me maybe I was looking for a quicker fix , it did work but not grea

  49. CharlesCharlest says:

     United Kingdom 🇬🇧

    Used it to treat green water in fish pond.
    Hasn’t had time to fully work yet but can see some improvement.

  50. Anonymous says:

     United Kingdom 🇬🇧

    Not a quick fix but use it, try to forget about it & in a few weeks there is big improvement.

  51. ElliottVJU says:

     United Kingdom 🇬🇧

    This is the best I used a different make to help remove algae but it crashed my pond ( note not an envil product )
    So I used envil equaliser and this Klear together follow the instruction to the word be patient and it worked magically
    I will only use envil from here on in
    Saved my fish and water I can’t recommend this product enough clear water from pea soup thank you Amazon and envil

  52. LeiaVillegas says:

     United Kingdom 🇬🇧

    A speedy delivery. Chose a business who already has good reviews and a competitive price.
    Using instructions given we applied a day after receiving, waited one week (and thought there might have been clearing but unsure), applied again 7 days later, then again another 7 days later. Pond clear so we can see right to the bottom. Lovely and we will continue to apply monthly while summer lasts. Would definetely recommend seller and product.

  53. Anonymous says:

     United Kingdom

    Golden Review Award: 17 From Our UsersI have to say, I’m pretty impressed with this. After reading the mixed reviews I wasn’t holding out much hope but it seemed to be a lot more natural and safer than some of the alternatives on sale.
    I have a 150 litre pond with no fish, no pump and only a solar air stone.
    The water was pretty green as it is in full sun for most of the day, I got some oxygenator plants and snails and then a week after used this.

    It’s very easy to use, I just worked out the amount to use and mixed it in, a week later I did the same as it is safe to do this and wuth really green ponds it can help.
    I would say two days after the second dose I could see about half way down, now about a week after I can just about make out the bottom.
    I for one have had good results and I wasn’t really expecting them!

  54. Diedre says:

     United Kingdom 🇬🇧

    can not fully understand the instruction for the measurement would be greatful if someone could let me know what they are in simple english
    many thanks

  55. Anonymous says:

     United Kingdom

    This product is fab . . My pond has thick green moss all up the sides and across the bottom to the extent we couldn’t see the fish . . We put double quantity in on 1st application as directed and within 24 hours you could see the fish within thr 1st week it has broken the moss up and is taking it off the sides . . We have cleaned pump and filters every other day as they have been green . . Cant Express how pleased I am with this product. . Well worth the money and so easy to use .

  56. Anonymous says:

     United Kingdom 🇬🇧

    Easy to use , it has taken 2 doses , with a week in between to make any difference, but it is clearing now .

  57. Anonymous says:

     United Kingdom

    My pond had only been built two weeks before it turned into pea soup. Purchased more plants, cut down on the food I was giving the fish and cleaned the filter every other day, but nothing worked. My soul was completely destroyed.

    Purchased this and thought I’d give it a try.

    After one day there was a slight difference. After three days there was a noticeable difference. After five days the pond is Chrystal clear.

    This stuff is a god send. Comes with its own measuring cap which is built into the spout. As long as you can estimate the water volume of your pond, you are good to go. Drop the potion into a watering can with the required amount of water ratio, and deposit into the pond.

    Wait for the miracle to happen. It really works.

  58. Anonymous says:

     United Kingdom 🇬🇧

    My pond was very green and murky prior to using this. It started working more or less overnight and I’ve ended up with very clear water. Not seen the bottom the pond for some time.

  59. Anonymous says:

     United Kingdom 🇬🇧

    Two applications so far and working well. Purchased two bottles one lost in post supplier put problem right without any issues. Happy with product and service.

  60. Anonymous says:

     United Kingdom 🇬🇧

    It was used to clear my pond after installing a new liner in my existing pond but the sun turned the water green , it wors well now

  61. IzettaBeeston says:

     United Kingdom 🇬🇧

    Pond suffers from algae and blanket weed every summer. Have uased two doses of Pond Klear & we have crystal clear water & no blanket weed. 🙂

  62. Anonymous says:

     United Kingdom 🇬🇧

    This year we decided we would have help with the algae bloom.
    After reading items found on the internet I can across the Envil pond Klear.
    It stated it doesn’t harm the fish which was our main worry.
    So we have since used twice with cleaning the filters and the water has definitely become clearer as we can now see the fish!
    It has clear instructions to follow, and the squeeze refill dose was a very useful addition.
    I would definitely recommend this product and would purchase it again.

  63. Mac Hulligan says:

     United Kingdom

    As I only put this in the pond yesterday it’s too early to say how it’s working. It’s much easier to use than some products, it’s a “squeeze and release” dosage system. There’s no smell.
    1st part of review written a month ago pond colour of a good pea and ham soup.
    My filter /pump system doesn’t work the only person who knew how to fix these was my father, he was knocked down by a dazzled driver a year ago and couldn’t even remember he had a pond ( he couldn’t even remember mum had died 4 months earlier) dad spent 7 months in hospital before he joined mum.
    What happens is I switch the pump on it’s supposed to circulate from top pond to bottom pond via filter. Oh the noise starts then all goes silent. I actually left it overnight one night to see what would happen. I found an empty pond the following morning. Lesson learnt. Everything switched off. Refilled pond.

  64. Anonymous says:

     United Kingdom 🇬🇧

    Bought this to tackle a green water problem as it says it can be used at 4 degrees C. The pond holds 10000l and has become very green after refurbishment due to a leak. I doubled the dose and have just added a second double dose after a week. The filter at the end of the first week was quite dirty so hopefully it’s beginning to work but as yet the water isn’t clearing. I have now purchased the stronger envii product which I shall add in a weeks time. I am aware that it can take a few weeks to see results so I will persevere with the treatment.

  65. VernonMccleary says:

     United Kingdom

    After using Blagdon’s Green Water Treatment for over a year and seeing very little improvement to the green murky water in my Blagdon Affinity Pool I decided to look to Amazon for answers.

    I came across Envii Pond Klear and read a lot of the reviews for this treatment and decided it must be good so ordered a bottle. A day later it arrived and I followed their instructions by going to clean out the filters in the pool, added a double dose of the treatment …. after 5 days I followed their instructions again and cleaned out the very green dirty filters ( had started working so quickly by the state of the filters ). The difference already is just incredible and as it states on the bottle it can take up to 8 weeks for the treatment to efficiently work. I can honestly say this pond klear is the best I’ve ever used and I’ve been converted to buy this again in the future. Comes very highly recommended by me !

  66. Anonymous says:

     United Kingdom 🇬🇧

    It’s the first time I’ve used this product and it seems to be having the desired effect. Easy to follow instructions with useful dosage attachment on the bottle.
    My pond was very green when I started but now, after 4 weeks, is beginning to clear.

  67. Anonymous says:

     United Kingdom 🇬🇧

    Arrived before time which was great, have put in pond but am waiting results. Found it a bit difficult to tip contents in pond as the blue ball in top of bottle seemed to stop fluid coming out, but that could be I’ve not read the instructions probably

  68. MarguerRoof says:

     United Kingdom 🇬🇧

    Excellent product, gave my green water pond 1 x double dose and 1 x single dose and water has been crystal clear for three weeks now. Qualifier, having had a heron to visit last year the pond has been emptied and cleaned and am starting anew. Pond has no fish and little planting so after restocking will be the real test. The concern I do have is that the instructions on the container do not tell you to turn off UV. Having used other products in the past which do require UV turning off I checked ENVII website where they clearly recommend no UV for a period of the treatment.

  69. Anonymous says:

     United Kingdom 🇬🇧

    My 180 gall pond suffered from blanket weed, nothing worked , this product does, but you need to use 2-3 times the dosage, which it does suggest for major problems – personally any weed will need 2-3 times dosage to work. BUT be ready for blocked pumps as a consequence. In the end I used a dirty water submersible pump connected to the filter box – The pump still blocked, but not as often. After 3 weeks of double dosing and initially cleaning the pump twice a day (or more), The water is crystal clear and the pump runs for a week to 10 days before needing cleaning

  70. DixieZRECx says:

     United Kingdom 🇬🇧

    I have a small 3mx2m pond 1m deep with u/v light and filter. The pond contains about 40 goldfish. Last year it was green and cloudy and I could not see the fish, none of the products I tried worked.
    Four weeks ago I began using Envii Pond Klear with no apparent effect for the first 3 weeks but in the last week the water has cleared and I can see the bottom of the pond. I am confident that the improvement in clarity is due to this product and intend to continue using it. The only problem I know have is that the fish are now clearly visible to our local heron population!

  71. Anonymous says:

     United Kingdom

    Golden Review Award: 48 From Our UsersOur new pond all of a sudden turned really cloudy and algae was all over the new lining. I have a good filtration system, but no matter how many times I filtered the pond it made no difference and the water went green. I bought this product and used the whole bottle. NOTHING HAPPENED. It stayed green. Then I noticed the algae on the lining was beginning to change colour and appeared looser after a a week or so. I continued to filter the water and actually used a dustpan brush to gently scrub the algae off the lining. After 2 weeks all of a sudden the water started to clear, i’ve Cleared the filters regularly of some really heavy algae deposits. Now it is so clear you could probably drink it. I can see every detail of the bottom 4ft down. THE KEY WORD IS PATIENCE. This is a biological product not a chemical, so it doesn’t blitz it overnight. Give it 2-3 weeks to work and work hard with it (cleaning filters regularly). I can only assume it was this product that killed the algae. I did also do a couple of treatments of pond clear to clump the algae better into the filters. Fish are very happy now (they told me themselves) ok they didn’t, but they are swimming around with big smiles.

  72. Anonymous says:

     United Kingdom

    Golden Review Award: 36 From Our UsersMy pond had quickly turned into a thick green sludge, it was pretty serious and I don’t have any filters as it’s just a small wildlife pond around 1 x 1.5m. I also didn’t realise you should test the pH and use a buffer if necessary for it to work well so all I had was the pond clear treatment. In desperation, I chucked in around 1/4 of the bottle and the same again the next day. Last night there was a load of rain and I was stunned to see the pond clear to the bottom! I still haven’t got around to buying pH testing paper or buffer but it seems it’s worked brilliantly without it and in just 2 days. I’ve added a bit more this morning and will keep monitoring it. Wish I’d taken a ‘before’ picture, he difference is incredible. Brilliant product!

  73. Fernando M. Pinguelo says:

     United Kingdom

    Golden Review Award: 14 From Our UsersI doubt anyone in the UK had a pond that resembled pea soup more than mine did, but after dosing x2 the amount of Evil Pond Klear as per the pack recommendation gradually, over time, the water has cleared and I can now enjoy my fish at times other than feeding time. It’s not crystal clear but it’s clear enough for me and I only used it the once and my pond his no UV filtration either. It doesn’t work overnight, but it definitely does work. I’m no scientist but it appears that the product forces the green bits to clump together just enough so that it forms a sludge that’s just thick enough to get caught in the fine filter wool substrate. Which leads me to one final point: if you want to get the most benefit be prepared to up your filter cleaning schedule for a while as with a 20,000l pond there was a fair amount of green sludge created and trapped i the filter as the water continued to clear. Recommended.

  74. MelbaGuayiyinw says:

     United Kingdom 🇬🇧

    This product has worked well, my pond is now clear. I had to use several applications initially, but the water became clearer and clearer. I have just bought another bottle, but the “measure system” on the bottle doesn’t work properly so the amount I’m applying is guesswork.
    I’m pleased with the results and will continue to use Envii Pond Klear.

  75. Anonymous says:

     United Kingdom 🇬🇧

    I am new to having a pond with fish. Only a half barrell and I got some pond snails thinking that they would keep the algae down. But set the pond up in one of the hottest driest summers on record. After a short time I realised the pond was becoming murky with algae growing until eventually I could only see a few inches down. I did a bit of research and bought this product along with a muck clearing powder. Initially I thought it wasn’t working and the pond looked awful but then all of a sudden realised that I was starting to be able to make out the pebbles at the bottom. There is still a way to go but it is a whole lot clearer than it was.

  76. Anonymous says:

     United Kingdom

    Golden Review Award: 2 From Our UsersMy new pond/water feature went from crystal clear to pea soup almost over night. Being something of a pond novice, I did some research and decided to try Envii Pond Klear.My pond is small,90L,so the doses were tiny, I decided to use the full 25mls and made it up with pond water,as per instructions. I used another full dose 5days later. Within a couple of days of that, I saw a small improvement and in less than 2wks my pond was back to lovely crystal clear water again. I’ve since used it every time I top the water up during this heatwave. My butt has run dry and I’m using tap water and the pond Klear has maintained the balance of the bacteria/algae brilliantly. I won’t be without this product now and highly recommend it.

  77. Anonymous says:

     United Kingdom 🇬🇧

    Having done a major clear and tidy of our pond early this summer we disturbed a lot of sludge and algae and our normally clear water became very murky.
    Using this with sludge klear and it’s slowly working. I can see where sludge is clearing off the stones on the bottom and our water is getting clearer.
    You must clean the filters and pump every few days. I have been mesmerised by how much sludge and algae they’re getting.

  78. CarlHolliday says:

     United Kingdom

    Golden Review Award: 16 From Our UsersMy pond was suffering really bad with blanket weed following winter …but was still crystal clear…I used Cloverleaf Blanket weed remover…this appeared to kill the weed but then my water went completely brown and the pond was covered in floating weed…issue now was the pumps feedingt the filter became blocked within hours of cleaning so for three weeks my pond looked terrible. I then bought Envil Pond Klear..this made a great difference within three days the water began to slowly clear …I then invested in a large cylinder pond pump which was none blocking..ie dumped everything into the filter. This worked great…although I had to clean my filters sometimes twice a day for the first week…but it worked and now my pond is crystal clear again. So to summarize both products appear to have eventually worked and replacing my traditional pump with a none blocking pump really worked

  79. Anonymous says:

     United Kingdom 🇬🇧

    Golden Review Award: 2 From Our UsersI don’t normally do reviews but this product is superb I have ablagdon patio pond it is in direct sunlight and has suffered from greenish brown water even this time of year I have used since 13/11/2017 I gave the pond a good dose as the ball that locks off the measure area had come loose the water went clear within 24 hours I did an initial clean of filters2 days later .It has now been just over 1 month the water is still clear I have just cleaned the pump and there is a lot less crud than useualin the filter box.And I donor havegreen slime over pump and the filters are a lot easier to clea

    Superb product packaging dodgy

  80. Anonymous says:

     United Kingdom

    Golden Review Award: 2 From Our UsersIt takes time to see results with this product. The scenario which we faced was a 200 litre water feature in which my wife had placed two goldfish, pebbles and some plants from our natural pond. Very soon the water and pebbles were totally green and drastic action was needed. We had a smalll solar pump and filter which was not up to the job and therefore we have installed a budget mains powered combined filter and pump; this aerates the water very well and filters it too.

    So how has this product performed? Not too well at first and I believe that this was due to the pump and filtration system, which whilst solar powered, had an additional battery powered option, which we used to ensure 8 hours of filtering a day. We persevered and purchased a better pump and whilst this had a UV lamp which is constantly on, the combination of the two is addressing the problem. The method which we use to treat our pond is to remove about 8-10 litres of water from the pond, dose it with 25ml of the agent, stir it well and then leave it to develop for 24 hours before introducing it to the main pond whilst the pump and filter is switched off – we leave it for 12 hours and then switch the pump back on – the UV lamp will kill the bacteria created by the concentrate, but we believe that it multiplies sufficiently to remove the algae in sufficient numbers to survive the UV light for an extended period of time..

    So why 4 stars? Well this is an intermediate report, however, I think that whilst this product has contributed, so has the new pump, plus I get really irritated when suppliers contact me asking me to review their products too soon, not once, but twice, particularly as from their own instructions they suggest that you may not see results for weeks.

    +++UPDATE+++

    A month later and 5 doses of the product the water in the water feature is clear and the large cobble pebbles are losing the algae at a rapid rate. I intend to continue dosing the water feature through the winter, probably once a fortnight initially as the water feature is in a shaded area and will not have any direct sunlight at all until the spring, plus I believe that the low water temperature will not promote algae to grow either. If I am wrong I will increase the dose – suffice to say the water is now clear – a combination of pump and this bacterial agent.

    In essence, I believe that this product, combined with a better pump and filter; which I clean each week has aided our relatively small pond to rid itself of algae. I now have to buy netting as the clear water has already ensured that the heron has been spotted in our garden and whilst the water feature is very close to our house, I have no doubt that in the spring, the heron will pay a fleeting visit – in every silver lining lurks a cloud.
    I will re-review this item in a couple of weeks to see if my small water features water condition has improved still further – certainly the debris being removed from our filter suggests that it will and that this product is contributing.

  81. Anonymous says:

     United Kingdom

    Although the pond is not crystal clear as yet, we don’t have a working pump or filter connected, so I’m pretty sure if we did, the product would have worked to its full potential by now. However, the product has definitely made a big difference and after each treatment, lots of gunk has come bubbling to the surface and you can see the fish more clearly. It has also stayed clear of weed. We will continue to use the product because you can visibly see it working.

  82. AleciaHutchins says:

     United Kingdom

    Golden Review Award: 12 From Our UsersI am a pond novice, my new pond is dark, smelly and a fish has died. I had been reading up on the internet and buying products with only short term benefits. Yesterday when the fish died I rung the BIO-8 helpline. The fantasic free advice without hard sell was amazing, I was advised not to use any products as I had been over dosing ! but to remove buckets of water and refill the pond with the hose held high to get oxygen into the water & to clean my filters daily. We spent over 30 minutes on the phone, I even had to examine the dead fish and describe the condition of the gills to ascertain cause of death. I understand BIO8 to be a family run business and I can’t praise them enough for their time, knowledge and support. I am hopeful that folllowing their advise I shall have a clean healthy pond very soon
    Well done BIO8 : can’t recommend such genuine knowledge and care highly enough. I will call in a few days with promised up date

  83. Fans says:

     United Kingdom

    Golden Review Award: 22 From Our UsersI used Pond Clear, almost in desperation after my pond, which had always been clear, suddenly became cloudy and dirty looking. I used the whole 1 Litre over a three week period and now have a much clearer pond. I have ordered more to continue the treatment until my pond is back to it’s previous clear condition. This is a great product that does what says. My only criticism is that there are no instructions on how to fill the measuring chamber at the top. I found squeezing hard did the trick.

  84. Dorothea9406 says:

     United Kingdom 🇬🇧

    I first used Envii Pond Clear 14 months ago (Apr 16). Although my pond is not particularly large, about 1000 litres, 900mm deep at its max with and 8 to 9 goldfish of all sizes I do like to keep it clear – yes we all do. Previously I’ve used a product called sludge buster that now seems unobtainable so I did a search on line and arrived here. Used in conjunction with “Envii Sludge Klear – Pond Sludge and Algae Remover, Treatment and Cleaner – Biological Starter”, I’m very pleased with the results; so much so that I’ve ordered a second bottle.

    As most of us know, you are always taking a chance with some products, but based on my experience I recommend this product. But please do follow the instructions on the bottle. I did.

  85. KelseyLongoria says:

     United Kingdom

    Golden Review Award: 38 From Our UsersIf you follow the instructions and advice then this works very well indeed. We had green water, blanket weed and duck weed. Oh and there were some fish in there somewhere. 2 weeks on and we can see the fish!
    I had tried several other products with very limited results. This has cleared my pond without harming the fish and frogs.
    Very happy custome

  86. Anonymous says:

     United Kingdom

    This is an an amazing product and the guys at Envii are really helpful if you have any questions. I had tried everything to clear my pond including a pond pump and had almost given up before giving this product a go. Get the triple strengh bottle and give it at least a double dose on the first treatment and depending on how bad the water is do the same the following week. Make sure you clean the filters every few days at the start – our filter is actually in the pond so we invested in a pair of waders! The water after about a month is now completely clear and I celebrated by buying a few more fish who are loving the fresh clean water. The guys at Envii recommended that I keep adding a small quantity of Pond Klear every couple of weeks to maintain the balance of good bacteria over bad. I will certainly do this if it will keep the pond as it is now. Highly recommended!

  87. Anonymous says:

     United Kingdom 🇬🇧

    Golden Review Award: 8 From Our UsersPond was suddenly hit by blanket weed this spring and I tried all sorts to sort it out. I had some good results and the water clarity improved but still had sludge on the bottom of the ond and over submerged rocks. So I resorted to Pond Klear Xtra as it got good reviews and promised what I needed. Remaining blanket weed died very quickly to go with me skimming it. The dead stuff caused problems but Pond Klear Xtra suddenly started to work (OK the bacteria need to grow and breed) and now half the sludge has been removed. Am continuing to dose the pond and clean the filters every couple of days and things continue to improve. It has taken a couple of months but has save me draining or using a pond vac to try to clear it all. Frogs are thriving so no ill effects there and birds are still bathing and drinking every day. Looking forward to a few more weeks of the little bugs chomping their way through the remaining sludge so I can enjoy the crystal clear water and clean environment of the pond.

    My advice is to ‘stick with it’ and not expect an instant result. It is not a cheap product but it does do ‘what it says on the tin’. Manufacturers emphasise it is not a quick fix so please don’t expect that – I doubt there is a “quick fix” for this problem!

  88. Anonymous says:

     United Kingdom 🇬🇧

    Golden Review Award: 29 From Our UsersThe left hand side of the photo was taken on 4 June 2016 before using the product, and the right hand side of the photo was taken today (31 July 2016).

    Due to the size of the pond and original state of the pond water, it has taken a number of applications and a few weeks, but the water clarity has improved considerably.

    I was noticing improvements week by week, gradually being able to see deeper and deeper into the pond. From not being able to see the fish at all on 4 June, I can now see them all the way down to the bottom of the pond (depth of pond is around 2 and a half feet).

    It might not give overnight results but with patience and following the instructions on the packaging you should notice huge improvements in time.

    I will be definitely be purchasing the product again.

    Water is much clearer.

  89. Chrissy says:

     United Kingdom

    Golden Review Award: 15 From Our UsersWe have used this 3/4 times now and the pond has got only slightly cleaner but nothing dramatic. We will carry on using it and hopefully over time it will get better.We followed the instructions and diluted it in a bucket using pond water and slowly poured it in using the correct amount for our pond.It will last a long time as you only need a small amount so pint for pint its good value.

    UPDATE:Following the above review which had the title `Pond is only a bit clearer` I had a reply from the seller advising me to clean filters daily until the water was clear and put in extra Pond Klear, which my hubby did and after a couple of days the pond has never been clearer, you can actually see the bottom.
    I also had an email off another purchaser who said that as Pond Klear is organic it does no harm to put extra in and theres no need to dilute, so between these two pieces of advise we have a nice clean pond and can see our fish. Thank you.