Clack and Fleck valves are your best bet, they are the shall I say set the industry standard. Both are used in residential and commercial applications. Beware of your lesser quality brands, I can give you a bunch of Kinetico valves that did not hold up. DO not buy from the big box stores either as those are if you want to call them "builder grade" THey will do for a short time in a pinch. Your best choice is to call a treatment / filtration company. have them come out, check your water and give you the corrective recommendations. Do not go to a plumber for water treatment problems, they generally have some knowlage ( more than the helpers in the big box stores) but you can wrap up alot of money in equipment and also fustration if not diagnoised, installed properly.