Pool Frog's Inground Mineral Reservoir 01-12-5462 gives pool owners a way to dramatically reduce their chlorine consumption with an all-natural solution, without compromising the cleanliness or health of the pool environment. Inground Mineral Reservoir's patented cartridge design utilizes natural minerals to kill bacteria and other organic compounds, and will greatly reduce common chlorine side-effects, such as swimsuit discoloration, skin and eye irritation, and a reduced odor. This system will not only make your pool feel better because of its filtering, but will save you money by reducing the amount of chlorine you will need to purchase your pool healthy.