This Kinetico Signature series water softener system was installed in a home with a water supply with 30 grains of hardness (anything about 10.5 grains is considered extremely hard). Plus this water supply had 10 ppm (parts-per million) of iron. Iron begins to stain when it hits 0.3ppm.
Our competition would have had to install an iron filter along side a water softener unit. But not with Kinetico!