... :Stage Descrption of cartridge Component Main Function 1 PP sediment filter polypropylene remove particles,sand,rust,collid..etc. 2 KDF ... Activated Carbon adjust the taste of purified alkalescent waterThe filter cartridge of each stage is alternative according to your ... of spare parts of purifiers can be provided, such as filter cartridges,housing, elbows,T-junctions, pipe.faucet, tank...etc.OEM ...