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Dosing H2O2

Jerry said:

"To achieve a concentration of around 9.5 - 10 mg/L using 3% H2O2, use 1
mL per gallon."

Is this effective on "green dust" algae, the kind that grows mostly on the
glass? How often can this be dosed? Put another way, how long does a dose
stay in the water -as- H2O2?