First stage: The Polypropylene(PP) filter.

It can remove the sand,the suspended solids, colloid, impurity, with large filtration area and fine filtration effect.( 3-5 months)

The second stage: Granular active carbon.

It can adsorb the heterochromatic, odor, hydrogen halide, organics, and other harmful substance. (6-8 months)

The third stage: block Activated Carbon filter.

It can highly adsorb heterochromatic, odor, hydrogen halide, organics, and other harmful substance, making the water good taste. (6-8 months)

The fourth stage: UF membrane

It  can cut off the micro suspended solids, colloid, bacteria, and remove the macromolecular organic compounds, so the filtered water can be drink directly.(2-3years)