Exposure Magic™ is a superior alternative to muriatic or sulfuric acid for exposing plastered pool finishes. It hangs on vertical surfaces for better finish exposure. The Magenta Stuff™ is 50% stronger than leading products; 1 quart treats 15,000 gallons. Fast-acting and long-lasting, this great product helps remove stains & scale and protects all pool finishes from staining & scaling. The Magenta Stuff™ cleans and helps prevent scaling of salt cells, helping to extend cell life.