Crystal Quest CQE-RC-04040 Water Cooler Multi-Stages Filter Cartridge With the CRYSTAL QUEST Water Cooler Multi-Stages Cartridge, water travels through 6 stages of filtration: 1 micron pad, KDF55, KDF85, GAC, ceramic ball resin and another 1 micron pad This cartridge is used on the Crystal Quest line of Hybrid, Sharp, Turbo and Elegant bottleless water coolers This is with both Ultrafiltration (UF) and Reverse Osmosis (RO) water filtration technologies The CRYSTAL QUEST Water Cooler Multi-Stages Filter Cartridge is compatible with the Crystal Quest Bottleless Water Cooler