I am considering switching to a polyphosphate-containing water filter for my refrigerator ice maker/water dispenser. Currently, I use softened water to prevent calcium build-up in the ice maker/refrigerator, but would rather not in order to reduce my sodium intake.
So, would polyphosphates greatly reduce the calcium buildup in my ice maker? (I'm worried about the low temperatures affecting their effectiveness). Or does it work only in hot water boilers? Should I use some other chemical based on my water chemistry? Or is it junk science?
My water pH is 7.4-7.7, with about 400 ppm of CaCo3 (in West Lafayette, IN).