Please do not hurt the birds with harsh chemicals in a bird bath. How would like to drink chlorine?

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.

Makes sense....copper is a great biocide and is used in boat bottom paint.

We have a small fountain that runs 24-7 in our birdcage. We have always used bromine glandular powder from the pool & spa store. Use only a "tiny bit" literally! You don't need to change the water. It will clear up on its own. We also use it in the cement bird bath in our garden . Keeps the water clear. ONLY A LITTLE SPRINKLE! One small bottle lasts about a year or more. We have been doing this for many years. Give it a try.

Hummmm…. I thought that was a man made material used for countertops !!

Oh, never mind….. that’s Corian !! :1rotfl:

I've used chlorine tabs for years and all the birds and animals drink out of it. No casualties yet.

You have encountered the eternal Florida Question. Shall the State Flower be Green Slime or Black Mold? Try dumping a gallon of vinegar in the fountain after you clean it out.