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Discussion Starter · #1 ·
Does anyone know the dosage per gallon of Potassium Permanganate per 1,000 gallons of water.

I raise Koi and I have a 20,000 gallon pool and even with a sand filter, I can not get rid of the algae. I have been told this chemical will kill it without harming my waterlilies or KOI, but I don't know what strength to mix it.
 

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I am not sure where you got your information from; while potassium permanganate can kill algae, it is not to be used when fish are in the pond at the same time! KMnO4 is a powerful oxidizer and will harm fish.
 

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