SeaKlear® 90247 1 gal Bottle Solar Shield® 4 per Case. Solar Shield® reduces evaporation and heat loss. Heat loss and evaporation can lead to increased costs of pool ownership. According to the Department of Energy, 70% of total energy loss in a pool is due to evaporation. Solar Shield® minimizes evaporation and heat loss by forming an ultra-thin invisible barrier on the surface of the water. Solar Shield® provides up to 1 month of protection per dose - for convenient, long-lasting coverage.