1. The first stage is 5.0 micron PP filter. Function: Filtering s, rust, mud, sediment, etc. In water. 2. The second stage is Milfunction+active carbon Function: Removing bad smell filtering organic sediment in water. 3. The third stage is USA active carbon + KDF Cartridge Function: Completely removing bad smell in water. 4. The fourth stage is 200G+200G Low pressure Rervse osmosis membrane Function: Filtering germ, virus, corpuscule, other solute chemical from tap
