Spa Life is a dry granular material used to safely lower the pH levels of your swimming pool/hot-tub water. It is designed to lower high pH values in your swimming pool/hot-tub as required, and it also helps prevent scaling and protects your pool equipment from wear and tear. Spa Life pH Minus works with most types of swimming pools/hot-tubs. pH Minus does not disinfect and is not a chlorine replacement.