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Learn how to measure and classify water hardness using different units, such as grains per gallon (GPG), parts per million (PPM), and millimoles per liter (mmol/L). Find out the effects of hard water and how to soften it with a water softener.
- PPM to GPG
Water hardness in the US is measured either in ppm (parts...
- PPM to GPG
One grain per gallon (gpg) is equivalent to 17.14 parts per million (ppm). Water hardness can be measured in gpg or ppm, but gpg is the most commonly used measurement. 20,000–80,000: This range signifies the grain capacity of most water softeners available on the market.
Check the water softener sizing chart below to determine the proper water softener based on your hardness (in grains per gallon) and number of people in your house: Hardness in GPG = Hardness in PPM/17.1
The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm).
Learn how grains per gallon measures water hardness, its consequences, and how to address it with water softeners. Find out the conversion from grains to ppm and the importance of correctly sizing your water softener.
Water hardness can be expressed in many different units, including French degrees, German degrees, Clark degrees, grains per gallon, mg/L CaCO3 (calcium carbonate), and ppm (parts per million). General conversions are below:
Water Hardness Reference Chart. Water Hardness Description. Grains Per Gallon (GPG) Parts Per Million (PPM) Soft Water. Less than 1.0. Less than 17.1. Slightly Hard.
