1. Whole-house softener system.
If your house tap water is the “hard water”, a softener system is necessary, at least a softener filter. It could help protect your health, fabric; extend the service time of RO membrane.
There are 3 kinds of methods to confirm the tap water is hard water or not:
A. Inquiry your local water supplier. Get a testing report, or find out the source water is coming from underground or not.
B. You can see the incrustant on the inner wall of boiler/kettle. Also, your towel or clothes are getting harder.
C. Abnormal and consistent hair losing.
There are 2 kinds of pre-purifier; T-shape purifier and PP cotton purifier. If the capacity of sadiment in tap water is very big, A pre-purifier is a good option.
3. UV light.
For most houses, as long as it’s tap water, the UV light is not necessary.