The amount on the label of 60% PolyQuat is the right amount to use. An initial dose for a clean pool is 9 ounces per 10,000 gallons and subsequent weekly doses are 3 ounces per 10,000 gallons. For your purposes of preventing algae during a stain treatment, use at least the initial dose amount. It's a viscous product so distribute it evenly with the pump running.
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