The water in Xuzhou is too hard, the water alkali is very big, every time I go back, I do not dare to drink directly boiled water.
The price of such water purifiers is really quite expensive, about 2-3 thousand dollars a piece.
But for the sake of health, you can still buy one.
Well-known water purification equipment from Germany, AHP, you can consider buying one for about 2 thousand dollars. Of course if you don't care about money, expensive water softeners can reach more than 15,000 dollars.