BioGuard Balance Pak 200 pH Increaser - 6 Lb BioGuard Balance Pak 200 - 6# BioGuard Balance Pak 200 raises pH in swimming pool water Proper pH level balance helps prevent equipment corrosion, etching of plaster, and wrinkling of liners caused by low pH Many swimming pool algaecides require the pH to be balanced in order to work properly pH Increaser for swimming pools