Grains per gallon is how your water hardness is calculated. You will see the abbreviation for this (GPG) in relation to the utmost hardness removing range for each water softener. The higher the GPG, the upper the grain capacity you may need. RO units aren’t designed to be used for https://waterheaterinstallation32097.targetblogs.com/30400243/indicators-on-water-heater-installation-you-should-know