SeaKlear® 90052SKR 1 gal Bottle Free & Klear 4 per Case. Free & Klear chitosan clarifier, phosphate remover and enzymes is designed for use in properly balanced pool water. It is an ideal weekly maintenance product that tackles common issues and reduces problems such as phosphate loading which can cause issues with pool surfaces and equipment. Free & Klear also treats the buildup of lotions and oils on both the filter and in pool water that can result in clarity problems.