BioGuard Balance Pak 200 raises pH in pool water. Keeping your pool's pH level balanced helps prevent equipment corrosion, etching of plaster, and wrinkling of liners caused by low pH. It is also important to swimmer comfort as it prevents eye irritation due to low pH. In addition, many algaecides require the pH to be balanced in order to work properly. Keep your pool in proper balance with Balance Pak 200.