Chitosan Natural Clarifier for Clear Water in Hot Tub & Pool - Double Strength Concentrate Chitosan Clarifier works better and does more than petroleum-based hot tub clarifiers. Patented formula is Eco-Friendly, 100% non-toxic, biodegradable, made from recycled crab shells. For all sanitizers and salt systems. Enhances ozone purification and improves performance of mineral systems like Nature2, Frog, Pool RX, by removing non-essential, stain-causing metals. You cannot buy a better spa water clarifier at any price. DOUBLE CONCENTRATED, MORE ACTIVE INGREDIENTS, LESS WATER. Clears cloudy water with natural Chitosan Removes scum-forming oils Removes stain-causing metals Makes filter cleaning easier Non-toxic -- safe around children & pets Two 16oz. Bottles Product notes: Use just 1/2 oz. weekly per 500 gallons. Unlike other products, does not interfere with metal ions from mineral sanitizers. Contains no polyacrylamides. Two 16oz. bottles for a total of 32oz.