In article ,
wrote:
algae is not killed by regular UV either.

I'm not certain what you mean by this. It's a very accepted practice with
fishtanks to keep ssupended algae out of the water column by UV sterilization;
it makes for the most crystal clear water ever seen.

Most cloudy water in a fishtank is supended felamentous algae. In a dark
room shine a flashlight sideways through it and you can see the tiny filaments
with the naked eye. The water appears slighly yellowish, bt not green until
it gets really bad.


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