2. If the water quality is poor, it is recommended to use a reverse osmosis water purifier, and the filtered water is the cleanest.
3. In areas with average water quality, you can use an ultrafiltration water purifier, and the filtered water retains beneficial minerals.
4. Use a water softener for domestic water such as laundry and bathing, and use a direct drinking machine for drinking.
5. The brand can be Germany Enmet, a big brand with good quality and packaging and installation. I suggest you take a look at Baidu's recommendation below.