MICROBE-LIFTALGAGAL Algaway 5.4 Algae Control Treatment for Ponds and Water Gardens, Safe for Koi Fish, Goldfish, Plants, and Decorations, 1 Gallon

First, I only use this in an old improvised pond/ pool (maybe 20 gallon) improvised from my 2 year old sons splash pool. I was worried about killing the fish but I added a capful, let it sit a few days and added the fish. They are still swimming! Should note directions say to make sure your pond is aerated so I bought a solar powered aerator and stuck the panel on the side with 2 side tape. Aerated the crap outa the pond/ splash pool. Happy fish. No algae whatsoever after 1 month!

We had been using another brand for past 2 years and 1 dose of this amd algae was GONE. Very Effective.

Sometimes it's necessary to empty ponds first.

I am a little disappointed in this product after reading the reviews. I have a 3 tiered fountain that struggles with algae growth. After two bottles, my fountain is still covered in algae. I love that it is safe(ish) for the animals but it did not work for cleaning my fountain.

Great product, worked wonders on my ponds. Only problem I had was how to measure the product to place in pond. Should have a chart that measures in cup size per gallon.

I used this item to get rid of the algae from my foundation but it didn’t work. I missed the return date by a month only because I kept trying to see if it would work but no luck. This product is worthless do not buy it

It took 2 doses and after 2 weeks the pond did clear. However, it will reduce your oxygen level and we lost a few fish. So use tiny doses is my suggestion and make sure you have a bubbler running in your pond.

Nothing bad to say about this product. So far it has helped to clear the water in a neglected goldfish pond. I would purchase it again