Hard Water / Grains Per Gallon
Hard water is water high in dissolved calcium and magnesium, measured in grains per gallon (gpg), where higher numbers mean more scale, more soap scum, and faster appliance wear.
Hardness is simply the amount of calcium and magnesium dissolved in your water. It is rated in grains per gallon: water under about 3 gpg is considered soft, 3 to 7 gpg is moderately hard, and anything above roughly 10 gpg is very hard. Many private wells and a lot of municipal supplies test in the hard range, which is why scale and lather problems are so common.
Those minerals are harmless to drink, but they cause real wear. They precipitate as scale inside water heaters and pipes, shorten the life of dishwashers and faucets, leave spots on glassware, and bind with soap to create the gray film known as soap scum. A water test gives the gpg figure, and that number directly sizes a softener: harder water and a bigger household mean the unit must regenerate more often.
Grains per gallon is the language every softener spec sheet speaks, so knowing your hardness is the starting point for choosing equipment. A simple test strip or a lab report tells you where you fall and how much treatment you actually need.
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- Backwash (Filtration) : Backwash is a self-cleaning cycle in which water flows backward through a filter or softener media bed to lift out trapped dirt and flush it to drain.
- Salt Bridge : A salt bridge is a hard crust that forms across the salt in a softener’s brine tank, leaving an air gap below it so the salt no longer dissolves into the water and regeneration fails.