This is the floating pool purifier that reduces the amount of chlorine required by up to 80%. An array of solar panels built into the purifier's top provides low-power current for an electrode coil that extends into the water. A mineral electrode insert fits into the coil and slowly releases ions that fight algae and bacteria without the need for an algaecide. It can be used while swimming. Unlike chlorine, hot days do not degrade the purifier's performance--its minerals will not evaporate. The electrode's insert lasts 12 months and also collects undesirable minerals such as calcium and iron, softening your water. 6" H x 12" Diam. (4 lbs.)