BioGuard Balance Pak 100 Alkalinity Increaser - 25 Lb BioGuard Balance Pak 100 - 25lb Bag BioGuard Balance Pak 100 is used to raise total alkalinity. BioGuard Balance Pak 100 is proven to help prevent pool staining, plaster etching or liner wrinkling Add directly to swimming pool water, dissolves fast Maintaining proper total alkalinity prevents pH from bouncing due to rain, bather load, and other chemical applications.