Twist undersink drinking water system complete with faucet, hookup, tubes and fittings. Reduces lead, chemicals (voc, tthm), pesticides/herbicides, cysts (giardia, crypto), chlorine, sediment, dirt, rust. Make your own premium great tasting water for pennies a litre. Compact - takes up minimal undersink space. Easy to install. Change cartridge in seconds without turning off the water - just twist off then twist on. 1 year limited warranty.