Siefrob, You have seen the same results I have on water (city). I used the same magnets that I used on my cars. I put them on my inlaws because they had a water conditioner in the past. They installed a new gas furnace and a whole house humidifier. My job was to service the humidifier. The water pad, made from aluminum would get crusty with minerals in a short time (monthly). I installed the magnets on the main inlet and on the copper pipe going into the hot water tank and going out of the hot water tank. I monitored the water pad regularly and found the pad was staying clean for several years. I think the magnetics causes the minerals to become like polarity so they don't stick together and stay in suspension, and flow to drain. The magnets would have to be sized to the amont of water flowing through system.
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