LeisureTime Defender 32 oz P/N: B Especially designed to prevent scale formation in spas and hot tubs. Features: Prevents scale formation Aids in the removal of exisiting scale Prevents dissolved solids from separting into spa and hot tub water Applications: Weekly: 1. Add directly to spa. Use 2 oz. for spas up to 800 gallons. Use 4 oz. for spas over 800 gallons. 2. Run filtration system for one hour, or normal filter cycle. Tips: Control of calcium can be very challenging, especially in spas. Regular use of Defender will prevent mineral buildup from occurring and causing the spa's heater or equipment to fail. Use as a follow-up to Metal Gon, applied at start-up. Compatible With: Chlorine, bromine, ozone and biguanide sanitizers.