Soft water is defined by american national standards nsf ansi 44 and nsf ansi 330 as water containing 1 grain of hardness per gallon or 17 1 mg l hardness.
Water hardness 15 grains per gallon.
Typically water that contains less than 1 grain per gallon is considered soft while.
If a test for hard water is measured in parts per million or milligrams per liter you can take the total hardness level and divide it by 17 1 to get hardness in grains per gallon.
Grains per gallon is the business standard approach for talking about water hardness.
The hardness on the softener head settings panel is determined by the number of grains per gallon of water gpg.
For example if your water test shows 250 mg l hardness you actually have 14 62 grains per gallon.
You need a calculator to convert ppm to gpg using a conversion factor of 17 1.
Jumping mg l by 17 1 will change it to gpg.
Water hardness can be measured in gpg or ppm but gpg is the most commonly used measurement.
What is soft water.
Beware of companies that tell you that each ppm of iron is equal to 4 5 grains per gallon of hardness.
To determine your daily hardness removal need multiply daily household water use measured in gallons by the hardness of the water measured in grains per gallon.
This range signifies the grain capacity of most water softeners available on the market.
One grain per gallon gpg is equivalent to 17 14 parts per million ppm.
Different agencies and organizations may use slightly different classifications when discussing water hardness.
Scientists measure water hardness in parts per million ppm or grains per gallon gpg.
The only time you see this is when an unscrupulous company is using a water softener as an iron filter.
400 gallons used per day x 15 grains per gallon hardness 6 000 grains of hardness must be removed daily.
Iron removal limitations will vary with water softener units.
Hardness is usually expressed in grains per gallon or ppm as calcium carbonate equivalent.
Plus if your water contains iron you will need to add some additional hardness to it.
Water hardness conversion table ppm mmol l mg l french degrees german degrees grains per gallon degrees clark 1 is 0 0099 1 0 1 0 056 0 058 0 07 10 is 0 099 10 1 0 56 0 58 0 7 14 3 is 0 142 14 3 1 43 0 8 0.
