BioGuard Balance Pak 100 Alkalinity Increaser - 12 Lb BioGuard Balance Pak 100 Alkalinity Increaser 12lb Bag Use to maintain total alkalinity in your swimming pool Proper total alkalinity prevents pH from 'bouncing' due to rain, bather load and other chemical application Helps prevent pool staining, plaster etching or liner wrinkling due to improper pH Dissolves quickly when added directly to your swimming pool water