Morton® System Saver® II

Ok, Let us open a door to some thing here.

Would like to know if any one and I mean any one has had any challenges with the Morton® System Saver® II salt, the one with the resin cleaner in it.

Now this is from their web site...
"Morton® System Saver® II Formula Pellets are made from a very high purity salt combined with the patented System Saver® II formula to make your water softener work better. Look for it in our new, redesigned bag.

* Patented formula contains softener resin cleaning additives
* Salt and cleaning additives are thoroughly flushed from the system during resin regeneration.
"

Now I know what it says, thoroughly flushed from the system during resin regeneration. But I am wondering if maybe some is left behind.

A customer changed to total System Saver II 3 years ago and some thing like hard water spots have showed up in the same time frame.

Softener is still delivering soft water , clear on that part..
Softener is still delivering Iron free water.. clear on that part..


Ideas?

I don't know anything about it and tell my customers to use solar crystal salt and if needed how to manually use Iron Out etc. on a timed basis instead of buying salt with a resin cleaner in it. It works better and usually is less expensive.