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The internationally recognized water hardness scale recognizes 4 water hardness classes; from soft, moderately hard, hard, to very hard. By definition, water hardness is the total sum of molar concentrations of calcium ions (Ca 2+) and magnesium ions (Mg 2+).
- PPM to GPG
Water hardness in the US is measured either in ppm (parts...
- PPM to GPG
According to the Water Quality Association, the hardness scale, measured in gpg of calcium carbonate, can be represented as follows: Less than 1 gpg is considered soft Between 1 and 3.5 gpg is considered slightly hard
The majority of findings are delivered as a number that reports the concentration of calcium carbonate or other equivalents for a given unit of water. The water hardness scale result may be expressed in parts per million (ppm), grains per gallon (gpg), or milligrams per liter (mg/L).
View water hardness levels for various cities in Pennsylvania to determine your Culligan water softener needs today
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.
The Culligan HE Water Softeners with Soft-Minder® Meter and Aqua-Sensor® sensing device are certified by IAPMO R&T against NSF/ANSI Standard 372, CSA B483.1, and NSF/ANSI Standard 44 for the effective reduction of hardness (calcium and magnesium), barium, and radium 226/228, as verified and substantiated by test data. The Culligan HE Water ...
Navigate through the map to find the water hardness level in your area and gain insights into the water quality by state. This resource aims to offer a quick, user-friendly guide to the mineral content and hardness of water in various regions.