Pool Magic+PHOSfree is ideal to treat your pool at the beginning and end of each season and to eliminate phosphates at any time as the first step of Natural Chemistry's Clear, Perfect Water Program. Pool Magic+PHOSfree contains all natural enzymes that break down non-living organics to make opening and closing fast and easy. A quick clean up to start off the season and prevents non-living organic staining and phosphate build-up in the off season. PoolMagic+PHOSfree contains SMARTZyme technology. SMARTZyme technology wastes no time breaking down non-living organic materials. A small amount of Natural Chemistry's enzymes can treat large amounts of water due to their ability to bind to non-living organic contaminants and reduce them to smaller and smaller parts, breaking them down to their original components such as carbon dioxide and water.