I use this, along with the algae fix, each week to keep the algae in my pond in check. It doesn't completely eradicate the algae, which is fine as the fish eat the algae, but it keeps the water clear and the algae from blooming out of control. Fish get a little squirmy for about 5 minutes after I apply it, so I can tell it disturbs them a bit, but they've been growing in my pond happily and healthily for 2.5 years. Birds use pond for bathing and drinking, and tree frogs reproduce like crazy, so it is definitely animal-friendly.
Rating:
[5 of 5 Stars!]