Model: FS-4 FS-4 Ceramic Water Filter 1. Tube 1 with D-250 0.9 or 5micron ceramic cartridge. 2. Tube 2 with D-250-Resin(cation resin). 3. Tube 3 with D-250-Carbon (KDF & activated carbon & Silver activated carbon). 4. Tube 4 with C-52 0.2 micron ceramic cartridge KDF+silver activated carbon.     Model:EF-100-C-CTO-AG. EF-100-C-CTO-AG Easy Filter 1. Ceramic Cartridge + CTO + CaSO3 + Nano Silver (AG).       Model: EF-100.PP-G EF-100.PP-G 1. Polypropylene + GAC     Model:FC-2 FC-2 Ceramic Water Filter 1.Tube 1 With FC-20" Ceramic Cartridge. 2. Tube 2 With FC-20"-CTO (Compressed Carbon) / FC-20"-GAC