What is soft water.
Water hardness grains vs mg l.
But in short to convert mg l units to gpg divide it by 17 1 and you will get the value you need.
0 to 60 mg l milligrams per liter as calcium carbonate is classified as soft.
Enter the value into a calculator and then check that you have entered the value accurately.
If hardness is in mg l or ppm convert it into gpg by dividing it with 17 1.
Mg l means milligrams per liter note.
Grains per gallon is the business standard approach for talking about water hardness.
Hardness is caused by compounds of calcium and magnesium and by a variety of other metals.
Formula to measure no of grains to be removed.
The hardness of high quality water should not exceed 270 mg l 15 5 grains per gallon measured as calcium carbonate.
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.
Concentrations of cations in water are expressed in grains per gallon gpg or in milligrams per liter mg l.
Different agencies and organizations may use slightly different classifications when discussing water hardness.
Water softeners will correct hard water of more than 270 mg l.
Water softer than 30 to 50 mg l may be corrosive to piping depending on ph alkalinity and dissolved oxygen.
If iron is present add 5 grains for every ppm mg l of iron iron must be dissolved iron it appears clear from the tap but leaves reddish brown stains.
Establish the hardness value for the water in mg l.
Ppm and mg l are the same thing.
The bottom line is softener always needs to be set against the actual hardness of water and not based on your assumptions.
This is your grains per day number.
Multiply the answer by your water hardness in grains per gallon to convert mg l or ppm to grains divide by 17 1.
General guidelines for classification of waters are.
Treated or softened water 0 1 gpg total grains x 17 1 equals ppm slightly hard 1 2 gpg total grains x 17 1 equals ppm medium hard 3 7 gpg total grains x 17 1 equals ppm hard 7 10 5 gpg total grains x 17 1 equals ppm extremely hard.
And more than 180 mg l as very hard.
Symptoms of hard water include.
121 to 180 mg l as hard.
Jumping mg l by 17 1 will change it to gpg.
Hardness is usually expressed in grains per gallon or ppm as calcium carbonate equivalent.
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.
I have a separate article about sizing the softener where i cover the difference between gpg and mg l more in depth.
