Hi there. Don't use shampoo bars or things containing natural soaps (based on carboxylic acids) if you have hard water. The scum with stick to your hair. When I had hard water in Prescott hyears ago, I got by with shampooing normally (shampoos, most of them anyway, sulfates, don't react with the Mg/Ca found in hard water) and then rinsing away any remaining Mg/Ca ions left by the shower water with distilled water. Your sebum contains carboxylic acids which like soap grabs hold of any magnesium it can find and doesn't let go. A gallon of distilled water lasted me 2 washes. I have "soft" water now but I hate it. It makes my skin feel slimy when wet and when it dries, its salt dries my skin and makes it itchy. Can't win.
ETA: you can use KCl (instead of NaCl) if you wish to avoid the sodium to regenerate the resin in your water treatment system but it may be a bit more expensive. A technical grade is fine. Buy it bye the ton and not in cute 40 pound bags at the big box stores
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