1 lbs of pure chlorine is about 1 gallon of 12.5% chlorine.
So ppm for Bleach is:
ppm = Gallons Bleach * (% Hypochlorite / 100) / Pool Volume (Gallons) * 1,000,000
ppm in lbs
ppm = lbs * (% Hypochlorite / 100) * .125 / Pool Volume (Gallons) * 1,000,000
Hope that helps.
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