Grains for each gallon is how your water hardness is calculated. You will see the abbreviation for this (GPG) in relation to the utmost hardness removing amount for each water softener. The higher the GPG, the upper the grain capacity you will require. Our manual tackled many of the questions https://jaidenckqye.smblogsites.com/29846418/sewer-video-inspection-things-to-know-before-you-buy