API Pondcare Pond-Zyme Enzymatic Pond Cleaner Barley, 1-Pound by PondCare

Bought this for my new wildlife pond. Really cleared up the sludge that had built up of its first summer. Water is crystal clear and does not smell of stagnation anymore. Highly recommend.

I have a small 155 gallon pond. My two goldfish had babies and now the pond seems to be getting dirty sooner plus had an excess of algae. Within two days of the first use, the pond was clear! And my fish seemed completely unbothered. I have put it in a time or two since for maintenance and so far so good. Great product!!

A little goes a long way. We add it and by the third say the water is crystal clear. We've used it a few time overthe year and it's amazing

Very good, did on excellent job on my swimming pool converted to koi pond ( still 5' deep) very happy with this product

Doesn't work. Koi eating it all up, my clear pond water suddenly all murky and covered with brown scum.