You purchased a mineral sanitizing system because you wanted an alternative to your chlorine tablet, saltwater, or bromine system.
You're looking for softer skin, softer water, less harm to your equipment.
One misconception is whether you still need a sanitizer, and you do.
So, in short - Sutro does work with mineral systems. Because we measure chlorine in true PPM (parts per million) and not mV (millivolt). We're able to turn down the volume on your chlorine consumption.
For our users that currently have the Sutro system - we're working on a fix for your application, but you can use the free chlorine value the way that you regularly would (if you were measuring chlorine yourself).