1 layer: Micron Granular Activated Carbon Filter to remove the chlorine, organic chemicals, taste, odor and color .also some bacteria .
2 layer:mineral stone:take the bacteria shock and increase nutrients into water.
3 layer:silicon sand. Purifier the dust and take the water into natural purify.
4 layer:actived carbon remove the bacteria as second safeguard
5l ayer:mineral ball enhance the nutrients into the purified water.
6 layer:resin to soften the water
