subject: Purifying Water: [print this page] One other method of water purification that uses sediment water filter cartridges is the faucet attachment. This allows the water filtration system to be attached directly to the faucet so that the water flows through it directly into a cup or pitcher. It is extremely important to keep the filter changed regularly in this system because a clogged filter means the water faucet will flow very slowly which is a problem in a kitchen sink setting.