Hydrophobic PTFE Cartridge Filter - TCF. Hydrophilic PTFE Cartridge Filter - TCFH. Coated Cellulose Acetate Cartridge Filters - TCY. Polypropylene Cartridge Filters. Pleated Polypropylene Cartridge Filter - TCP. Depth Polypropylene Cartridge Filter - TCPD. Wound Polypropylene Cartridge Filter - TCW.