In article ,
Richard Santink wrote:


Against procaryotic alge: peroxide 1:10 for 15 mins.
Against green algae: bleach 1:20 for 4 minutes
Against everything: copper sulphate. I'm unsure of the dose.


Isn't potassium permanganate used for this also?

Yeah, and alum. But they only kill animals not algae.

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