Hard water can be turned into soft by this automatic water softener. Calcium, magnesium and other minerals and elements in the water can be removed by the water softener, so as to make the water suitable for laundry, cleaning, and other purposes. It can be installed on the roof of the building, connected to the water lines. The calcium and magnesium positive ions will be removed by this automatic water softener from the hard water. The electric charge in the water is balanced by releasing the sodium ions into the water treated. There are two tanks, one is brine tank and the other is mineral tank.