Siemens Water Technologies offers a wide range of filter cartridges and housings to meet various application and removal needs. The Postpure PP™ filter cartridge is manufactured of materials which are FDA approved for food contact applications in accordance with Title 21 of the U.S. Code of Federal Regulations. All polypropylene components also meet standards for biological safety as per the USP for Class VI-121°C plastics (gaskets/O-rings excluded).