With San Antonio city water specifically, anyone should use around 1 to 1 ½ bags of salt per month (40Lb bags). Put 3 to 5 bags each quarterly year and all should be good. The hardness of the water and size of softener will determine the amount of salt it will require for each regeneration. If a system is sized correctly, it should regenerate about once a week, so at the end of the month using 1 to 1 1/2 bags of salt. (Calculations are with average of 4 in household) **Water softeners should not regenerate every night.**
If you are on well water the hardness of the water will determine how much salt you will use. Some houses have hard water 148 over by our office. But typical San Antonio water is 16 to 22 hard typically. There are different levels of water hardness throughout the city.
Salt comes in different forms; crystals, pellets, tabs, grained, etc. The bags are actually color coded while crystals and solar salt come in the blue bags. Pellets come in yellow bags. Green bags are for people on well water that need to treat their water for iron. The manufactures tend to change the look of some of the bag however, the color system stays in place, regardless of hue.
If you want more information about how much and how often should my water softener be needing salt please call me at (210) 960-2555 or email us at email@example.com.