Slaked lime and calcium chloride
I live near Madison, Wisconsin, where the water is very hard. We've got a lot of temporary hardness, and several of the local brewers (another hobby) use slaked lime with additional calcium salts to remove. Typical water parameters are:
Calcium (Ca+2) 70
Magnesium (Mg+2) 41
Sodium (Na+1) 9
Chloride (Cl-1) 19
Sulfate (SO4-2) 21
Total Hardness 344
Bicarbonate (HCO3-1) 364
Residual Alkalinity 224
I'm wondering if any of you out there with similar water profiles are pretreating your water with slaked lime and calcium chloride to remove the temporary hardness? According to my brewing/water geek friend, the addition of 1 gram of slaked lime and .5 gram of calcium chloride per gallon will reduce the bicarbonate to about 50 ppm.
Yes, I know I could use RO water (I even have an unused RO unit in my attic), but even with 50% RO, we still have pretty hard water. Plus, RO creates a lot of waste water. Slaked lime and calcium chloride are dirt cheap, and I wouldn't need much to treat 50 gallons at a time.