Will a whole house water softener harm the R.O. unit?
No, calcium and magnesium (lime scale) are two of the hardest minerals for the R.O. membrane to remove. Sodium (added to the water by the softener) is much easier on the membrane and it will reject 99% of all sodium in the water. With a water softener you will always get 12 months out of the pre-filters and 3 years out of the membrane.
