LIQUID HEAT SHIELD – Sunheater Liquid Heat Shield helps your pool retain heat by forming an ultra-thin, invisible barrier on top of your pool water that reduces evaporation, the main cause of pool water heat loss. SAFE FOR SWIMMERS – The non-toxic, odor-free formula is 100% safe for both swimmers and pool equipment. EXTENDS SWIMMING SEASON – Sunheater Liquid Heat Shield is better than a solar blanket! There’s no messing around with cumbersome blankets and reels, but it can still extend your pool season by keeping the water warmer for longer. SAVES CHEMICALS – Not only does this liquid solar blanket for pools retain heat, but the reduced evaporation also helps reduce chemical loss. EASY TO USE – Simply add the amount designated for your pool using the easy-to-read markings on the bottle. Use just 4 oz for every 20,000 gallons of water.