Hayward BLUE-ESSENCE-35 (FL & CA ONLY) In Ground Salt Chlorination System 35K gal converts a small amount of salt into an endless supply of chlorine - satisfying 100% of pool and spa’s chlorine requirements. UV and Ozone advanced water treatment offers the ultimate in water quality and purity, eliminating 99.9% of chlorine-resistant microorganisms while reducing overall chlorine use by 50% or more. Irritated skin and eyes and chemical smell are a thing of the past - just healthy, clear, soft water.