GLB Chlorine Stabilizer will cut chlorine loss caused by sunlight. Customers save money when they use GLB Chlorine Stabilizer. If you use GLB Chlorine Stabilizer you can cut chlorine consumption by up to 25%. GLB Chlorine Stabilizer will help sustain ongoing chlorine residual. Add this product to your pool in the spring, and you will improve chlorine effectiveness all season long. Contains 100% Cyanuric Acid.