The SolarPill is an innovative little product that packs a big punch. This thermally insulating liquid blanket slowly releases into your filtration system and forms a harmless, invisible barrier on the surface of your pool water to reduce heat and chemical loss by preventing water evaporation. The advantage of this liquid solar blanket is that it is always working, even with swimmers in the water. One capsule treats 12,000 gallons for one month. The SolarPill can be used with traditional chlorine, salt water and mineral sanitizers. It is safe for use with all types of swimming pools and will not affect chemical balance.