Re: algae in ceramic fountain
Pour a 1/4 to 1/2 cup of hydrogen peroxide as necessary to control the algae growth. I've got a 125 gallon pond that I used to use chlorine in to keep clean. The chlorine didn't last long and while it would drop the algae to the bottom, it wouldn't remove it/kill it. When I started using peroxide, the pond would last longer between treatments and algae would be completely obliterated. The best part about using peroxide is that you're not using anything that is harmful to the environment or the the animals if they drink.
The best thing to do would be to drain and clean the fountain thoroughly, then refill and add the peroxide. The peroxide is more effective as a preventative than it is trying to recover a contaminated system, though it will work either way.
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