Chlorine Stabilizer, Product Label Chlorine Stabilizer, Container Type Bag, Container Size 4 lb, Cleaner Form Granular, pH Value Acidic, pH Level 4.8 to 5.2, Standards EPA, Biodegradable No, Calcium Free No, Color White, Fragrance Unscented, Phosphate Free Yes, Primary Chemical Cyanuric Acid, Properties Phosphate Free, Salt System Compatible Yes