ditttohead
Water systems designer, R&D
Lowering the hardness changes the way the system is regenerated. Efficiency settings, etc all affect the performance of the softener. Here is an old article that explains the difference between soft, and very soft water excellently. http://www.wcponline.com/2012/03/05/soft-soft-water/
Here is a chart that also explains this in a lit
tle more detail. Even a few ppm of hardness can negatively affect the performance of your water.
Here is a chart that also explains this in a lit