BioGuard Balance Pak 200 pH Increaser - 2 Lb BioGuard Balance Pak 200 pH Increaser 2# Bottle BioGuard Balance Pak 200 will raise the pH in your swimming pool Helps prevent equipment corrosion, etching of plaster and wrinkling of liners caused by low pH Prevents eye irritation due to low pH 1 lp per 10,000 gallons of swimming pool water