How is hard water measured?
Hard water is usually measured in either “parts per million” (PPM), “milligrams per liter” (Mg/L), or “grains per gallon” (GPG); PPM and Mg/L are actually the same measurement. If you know your PPM or Mg/L of water hardness and need to determine what your GPG amount is, divide your PPM (Mg/L) by 17.1. (One GPG = 17.1 PPM or Mg/L).
Hard water is usually measured in either “parts per million” (PPM), “milligrams per liter” (Mg/L), or “grains per gallon” (GPG). PPM and Mg/L are actually the same measurement. If you know your PPM or Mg/L of water hardness and need to determine what the GPG amount is, divide your PPM (Mg/L) by 17.1. (One GPG = 17.1 PPM or Mg/L).
