... filtration, make comprehensive purification to remove mud, sand, suspension matters, colloid, hea water filter housing A: Specification:Rated voltage : ... sediment : 3 to 6 monthParticle active carbon: 6 to 12 monthRO membrane : 12 to 24 monthPost active carbon : 12 to 18 month C: Product ... high and sudden changes in original water pipe have a dramatic impact on the product, ensure the product work ...