Designed for use with the RO Buddie 50 & 100 GPD models. Sediment cartridge removes particulate material found in tap water. Operating Life of 2,000 to 3,000 gallons depending on water quality. Carbon cartridge removes chlorine from most incoming tap water supplies for up to six months. Operating Life of 1,000 to 1,500 gallons depending on water quality. To install remove threaded fittings from existing Sediment and Carbon cartridges and use in new replacement cartridges.