The first level: PP cotton: removes all kinds of visible matter/dust and impurities in tap water.
Second and third level: front activated carbon: some low-cost water purifier third level is also PP cotton, carbon to remove chlorine and organic impurities. It also absorbs odors, colors and smells produced by organic compounds in the water.
The fourth level: ultrafiltration or reverse osmosis membrane: the membrane can remove bacteria, viruses and spores and other substances in the water.
Fifth level: Post-activated carbon device: further improves taste and removes odors.
Expanded information:
Water purifier cartridge function:
1, polypropylene spray soluble cartridge (PPF)
Filter function: to remove sediment, rust, algae and other solid substances in the water.
2, softening resin cartridge
Function of the cartridge: softening cartridge adsorption of heavy metals in the raw water and excess calcium, magnesium and other cations, soften hard water, anion exchange resin can only exchange anions, can not exchange cations.
3, granular activated carbon cartridge (UDF)
Function of the cartridge: to remove residual chlorine, odor, and solid impurities in the water
4, compressed activated carbon cartridge (CTO)
Function of the cartridge: to further remove residual chlorine, odor, and solid impurities in the water.
5, ultrafiltration membrane filter (UF)
Cartridge function: to remove sediment, rust, suspended solids, colloids, macromolecules and organic matter in water.
6, mafanite ceramic ball cartridge
Cartridge function: mafanite ceramic ball contains selenium, zinc, nickel, cobalt, manganese, magnesium, calcium and other 30 kinds of beneficial trace elements, these elements emit the start of the wave and the start of the body's cells is the same fluctuation state.
Baidu Encyclopedia - Water Purifier