Katadyn pocket water filter. The classic 2010 model expedition & travel water filter. Ergonomic handle, highest quality construction,exclusive silver impregnated ceramic cartridge removes Bacteria, Giardia and Cryptosporidium. In excellent condition, fully working order and complete with filter tubing with extra mesh filter, cleaning tool and storage pouch. This cost over £200.00. I have used this superb water filter in South America to protect me and although the element works i would recommend a new element be fitted. These can filter up to 50,000 litres so can last a very long.