Pondworx Pond Bacteria - Concentrated & Formulated for Water Features - Safe for Koi - 16 Ounces & Treats up to 2,500 gallons of Water

I have 2,200 Gal pond with eight large KOI's, normally water is kept around 1,600 - 1,800 Gal. There are two 75 Gal wells as primary and secondary mechanical + biological filter as there are Matala filters + 6 Gal of K3 Filter media in there. Both wells are constantly aerated ensure full circulation and to help those bacteria breath a little better. Then another 3500 AquaScape filter + 28W UV and another external 36W UV. For the past 3 years, I've been using Microbe Lift Prof - with a kind of hit and miss result. Hit - during the period where there was less leaves (main culprit is pine needles). Miss - when there were more leaves. As a result, I would have a few weeks of crystal clear water then slowly murky from sludge after 4 weeks . . by the time it hit 6-8 weeks, I must change 30% - 40% of water. Even at this maintenance routine, I began to have green algae growing thicker on all pond walls and water began to turn light green. The foamy gunk is becoming more of an eye soar, . . . I realized that to get out of this cycle, I need to try something different. Having read a lot of reviews, I decided to give Pond Worx a try toward end of April'19. I use a a slightly higher dose than recommended, i.e., first time 16 oz, then 8 - 10 oz. weekly. - First 3 weeks - - I pour Pond Worx in the main part of the pond (where the KOI's are). It does not turn crystal clear yet but it did not get worse either. I review more reviews of Pond Worx and see someone saying the bacteria need good aeration to get better result, so, I gave it a try. - I added Pond Works to the 2 wells instead.Then, turned off the pump and let it sit aerated there for 3-4 hrs (or longer). Then turn on the pump. Within 5 days, the pond became crystal clear. Foamy gunk is still there but much less. I have maintain this weekly routine for another 6 weeks and the water is now crystal clear, algae on the walls are almost gone. So far, from W1 - W9, I did not do any major Water change. Just add more refill to replenish those the evaporated during the the very hot month of June. So far, I'm quite satisfy with this product and about to re-order.

Good and reliable product, I’ve been using it since last year and I have significantly less algae than before.

Helped with clearing up the algae and water clarity within a few days. Will need to repeat but good stuff

This product seems to be working, and compared to other options, this is a strong alternative.

Update: this worked well at first then seemed to cause more muck than it got rid of and we lost a lot of blue gill. ******************************((( We have a fairly large pond (@ 1/4 acre and 8 ft deep) and have koi so did not want anything that was toxic to control the algae. This combined with the dye works well. We had a lot of algae on the sides of the pond, my husband scooped as much out as he could then added 1/2 gallon of this and it cleared within a week. We had a drought that almost emptied the pond last year, then received enough rain this spring to fill it back up so the good bacteria needed to be restored, which this did.

Pros: This really works on clearing my 1/3 acre pond. It went from brownish water to crystal clear in about two weeks. No negative impact on the pond in any way. I used a full jug since the pond is about 13 ft at the deepest and averages 6 ft. Cons: The water will start to revert back if you don’t apply again every 2 months.

Don’t work! Put 3 gallons in a 75x75x8’deep pond. No dead fish or algae. Waste of money

This stuff seems to work well. We have an algae issue in our one acre pond and it seems to be clearing it up. It is supposed to be safe for fish and wildlife and we have not seen any issues with the ducks or fish or turtles. It has been about a week and it seems to be working already.

My small koi pond was full of algae due to direct sunlight for more than 10 hours a day. Despite 2 UV lamps algae still cover 70% of the sides and base. 2 weeks after applying Pondworx the base and sides began to clear up to 40% and the aeration pumps also became more vigorous! Bought second bottle already!

My garden has a very large natural pond which unfortunately had a problem with biofilm. I used the full container of PondWorx Pond Bacteria and the following day the pond was much improved; a couple of days on and the pond has greatly improved and the water is clear. I can actually see the fish again, which by the way are unharmed. I would definitely recommend and will continue to use periodically or should the pond have another problem with biofilm. Depending on the size of your pond it could become expensive, however this works.

This bacteria works great. I start using it in the spring and before long, maybe a couple of months all the sludge in the bottom of the pond is just gone. If you want to accelerate the process, I noticed if you add an air hose to the area it works even faster

Very good

Brilliant stuff. Value for money and works a treat. You do need to use regularly to keep the effectiveness up. We have a large pond pool120k+ ltr