The Katadyn TRK Ceradyn Drip Filter Replacement Cartridge is the heart of the Katadyn Drip Filter. It will filter up to 13,000 gallons (52,000L) of water and has an output of a gallon (4L) per hour. Specifications: - Filter Construction: Ceramic - Field Maintainable: Yes - Flow Rate: 1 Gal (4L)/hour - Weight: 1lb 8oz