I would like to know how your determining your numbers are bad? If your listening to your salesmen, remember he wants to sell you his system.
I am going to assume that your TDS, & Hardness numbers were measured in PPM (parts per million) or mg/L (milligrams per liter). PPM & mg/L are equal to each other. If this is true, your hardness is 12ppm, which is not hard at all, that is very much so on the soft side. Very soft water can also attack interior plumbing and appliances such as iron or copper. Putting a softener on your home would not correct this problem, in fact only make it worse. Your TDS is alittle on the high side depending on what source its coming from. At our water treatment facility, we have two commercial wells on site and also take in surface water from a near by creek. Both of our wells have a TDS of around 200 which is considered to be on the normal side for ground water vs our surface water that has a TDS of around 100. A precipitation test is obsolete these days because of how inaccurate results usually were because of the amount of variables in the water tested. The only people still using precipitation tests are water treatment system salesmen as a visual test to convince customers that their water was bad and that they needed equipment to improve the quality, although the minerals precipitated are harmless. You did not list what the pH or alkalinity of the tested water was? Low pH water will also attack household plumbing. Alkalinity is the waters ability to resist pH changes. If you want to eliminate the chlorine taste install a whole house carbon filter, but when purchasing make sure you pay attention to the capacity of the filter. Most filters are only rated for so many gallons or months and after that it will begin to re release the taste back into the water.
Did they do a salinity (salt) test on your water from
Steve's Plumbing & A/C? If there is a high amount of salinity in the water entering your home its going to taste bad and attack everything metal it touches no matter how perfect your TDS, pH, or hardness is. I mentioned this last cause this is highly unlikely to have salt water since its coming from a treatment facility.
AJ
Licensed Water Treatment operator.