Crystal Quest CQE-RC-04038 Water Cooler GAC Filter Cartridge Water Cooler GAC Filter Cartridge removes volatile organic carbon compounds (VOC's), insecticides, pesticides and industrial solvents The CRYSTAL QUEST Water Cooler Multi-Stages Filter Cartridge is compatible with the Crystal Quest Bottleless Water Cooler This CURRENT CQE-RC-04038 was formerly known as OLD WCF-18-G-2