Water Softener Calculator

 How to calculate the number of GRAINS to set a Water Softener:

HARDNESS = 350 ppm or 350 mg/l divided by 17.1

Divide Hardness (ppm / mg/l) by 17.1

Example: 350ppm (Hardness) divided by 17.1 = 20.47 Grains (How many grains to set your water softener)