The Carbon Cartridge by Katadyn works with your current pump filter to help reduce chemicals and bad taste.  Just slide on your existing outlet hose and fill with carbon (included).  When water quality begins to decline, the carbon is easily replaceable. 

The Carbon Cartridge is designed to fit snugly into the opening of a 32oz Wide Mouth bottle making filtration even easier.  It will also accommodate the tubing from your hydration system to fill directly.  The Katadyn Carbon Cartridge is compatible with all Katadyn pumps and most other filter brands as well.  Includes 2 Carbon Refill packs.  Additional Carbon can be ordered above under "Related Products".