Borrow a promotional picture of a domestic brand:
The waterway is roughly divided into three ways (please ignore the catering machine on the way):
Direct drinking water road: it needs the most thorough filtration, and RO is the most suitable choice.
Kitchen waterway: general filtration, regardless of the problem of soft and hard water, ultrafiltration can be used.
Shower and laundry waterway: If you need soft water, just install a water softener.
Water purification effect test: the water purifiers of regular manufacturers can achieve the expected water purification effect. If you are not at ease, you can check the water quality through the water detective or TDS.