API Pond-Zyme Sludge Destroyer Pond Sludge Remover, 16-oz bottle

Goldfish and their Koi cousins - are just plain dirty! They'd be happy, living their lives in murky, muddy water - but we wouldn't get to see their beauty, and few people would want to keep a mucky mini pond with mostly invisible occupants. This stuff provides both barley and bacterial colonies for breaking down pond sludge, plus clarifying the water so you can actually SEE your beauties! Helpful after pond/tank vacuuming and water changes, this boosts biological activity in your filter system and substrate. This is a dry, powdery or crumbly material; my fish always eat some when added to the tank. I first saw this product being used in large ornamental Koi ponds; my own tank is 75 gallons, and is easier to maintain for goldfish if I pretend it's a tiny pond, rather than a large tank. Very effective, and inexpensive for the amazing results it will produce in your pond/tank.

Give this product a chance and it WILL work. I live in Ohio and my pond turned to nothing but sludge and algae toward the end of last summer. Nothing I did removed it. I have 8 goldfish in there and couldnt even see them. I dont like using chemicals so I decided to try this. I also used Tetra Pond Block for algae removal which IS a slight chemical. Together, i am seeing a huge difference in my pond. Its been 2 weeks but be patient. I now see my fish. These products will not work overnight as some claim. I initially started cleaning my filter pads 2x/day and now Im down to every other day. They will not work by themselves. You must devote some time to this no matter what but you are not draining and scrubbing the pond. Simple maintenance plus netting out the dead algae after cleaning the filter pads WORKS. Give it a try but be patient if your pond is really bad.

This product performs well, helped clear up the water in my pond.

I filled a 252 gallon outdoor tank with fresh well water and a few hours later added the amount specified. The next day, there was what looked like a film over ther water. I stirred the water and at least half the dose disappeared, mixing into the water and heading to the bottom of the tank. With movement after the powder soaks up the water and becomes moistened, the material is finally able to sink. Just by the smell I know it is a good product but am afraid that my large goldfish might breathe the stuff in. I am going to use it only when I can see a need to add some, just as a protective measure for my fish.