Effectively eliminate algae and reduce the amount of salt chlorine production in your pool with this proprietary blend of minerals that fight algae and promote low levels of chlorine in your water. These minerals dissolve and form a stable residual throughout the pool water for up to 6 months. By eliminating algae, this mineral unit frees up low levels of chlorine to be more active in your pool water to achieve a clean and clear look. This also helps to aid in the longevity of your pool equipment with a decrease in chemical usage and maintenance times. Prolong the life of your equipment, save money, and improve the quality of your water with this PoolRx Blue Mineral Unit for pools 7,500 to 20,000 gallons.