The Katadyn Carbon Style Cartridge - For All Pump Style Systems may be used with all brands of water systems. The activated charcoal in the replaceable cartridge reduces chemicals like chlorine and bad taste in your water. The pack of one cartridge and two carbon packets treats up to 60 gallons of water. The cartridge attaches to a 0.25 inch inlet and outlet hose so it's easy to use with any water container. Bring one with you when your adventure takes you to places that don't have clean drinking water to make sure you stay healthy and hydrated.