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Most of your home stores like Lowes carry test kits and if you know someone who has an aquarium setup he would have testing chemicals to test the water for hardness and PH and all kinds of stuff....

They do need maint. maybe every 7 or 8 years or so. Evertually the resin has to be replaced (you can tell because it becomes mushy) and if the unit uses electrical solenoids the switches can...

Interesting. Usually hard water, as it relates to water softening is expressed as grains per gallon and that's how my water softener is set for recharge. Reverse Osmosis units though go by PPM of...