Green Vista Oxy-Pond, Stream and Waterfall Cleaner - 5 Pound Container - Removes Organic Debris and Green Scum from Water and Surfaces - Uses Oxygen's Natural Power - Safe for Koi, Other Fish, Plants

Great product clean waterfall and koi pond

It may be appear cheaper than other brands, but only half of the container is full, so you'll be buying much more...

I let it sit fora behold directly on algae and it killed it off.

If algae is thick you may need to reapply more than once

Nothing

Worked great and cheaper than other brands.

this cleaned my waterfall & helped to clear 2000 gal. Koi pond with 50 fish in less than 2 hours. am using it bi-weekly & works great. was pressure washing weekly & this does much better job. am oedering more right now.