I bought a house in SW Iowa - the water is pretty hard -the sinks and tubs have red stains and the faucets have white crystals on them. I bought a water softener (we are having the house COMPLETELY replumbed, with PEX tubing). I do trust my plumber; however, he recommends only hooking up the softener to the water heater. I think that it should be hooked up to the whole house (EXCEPT: the outside faucets and the fridge/icemaker water [which has its own filter]). Any professionals have any input? We don't want buildup in our washer (we only wash clothes in cold h2o) or our kitchen faucet and stainless steel pans, but if it's not needed, it's not needed. Appreciate any input - especially those who have real experience with this. Thanks!!!