Leisure Time Spa Chemicals Spa Scum Enzyme is a blend of natural enzymes that breaks down oil, lotion, and organics that cause unsightly scum lines and odors in spa water. Helps reduce the need for maintenance of filters and spa surfaces. Works with all types of sanitizers.Tips:Repeat once each week to keep spa free of buildup.Compatible With:Chlorine, bromine, ozone and biguanide sanitizers.Initial Treatment:1. Add 1 oz. per 250 gallons of spa water.2. Repeat daily until scum line is gone.Weekly:1. Add 1 oz. per 250 gallons of spa water weekly to avoid build up at water line.