Be VERY careful using Chlorine bleach; it will destroy the seals and gaskets in the pump.
I have a waterfall and starting with a clean system I add the recommended amount of pond algaecide that I buy at Home Depot. Don't add too much as you will get foaming. Our waterfall has autofill that off of our reclaimed water line (sprinkler). It is not the purest and yet the algaecide keeps the algae under control for over a year.
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