After raw water enters water treatment, it needs to go through three pre-treatment procedures:
1. Filter out larger particles with quartz sand;
2. Enter the hard water softener, remove the calcium and magnesium plasma in the water;
3. Water softened into the activated carbon tank, remove chlorine and chloramine in the water; After pre-treatment, the water is purified again by reverse osmosis membrane to remove ions, microorganisms and heavy metals and form pure water, also called reverse osmosis water (RO water).