Water softeners will correct hard water of more than 270 mg l.
Water hardness grains vs mg l.
Ppm and mg l are the same thing.
If hardness is in mg l or ppm convert it into gpg by dividing it with 17 1.
Different agencies and organizations may use slightly different classifications when discussing water hardness.
Typically water that contains less than 1 grain per gallon is.
Grains per gallon is the business standard approach for talking about water hardness.
121 to 180 mg l as hard.
The hardness of high quality water should not exceed 270 mg l 15 5 grains per gallon measured as calcium carbonate.
Hardness is usually expressed in grains per gallon or ppm as calcium carbonate equivalent.
61 to 120 mg l as moderately hard.
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.
A grain of water hardness is comparable to 1 7000th of a pound.
Water softer than 30 to 50 mg l may be corrosive to piping depending on ph alkalinity and dissolved oxygen.
0 to 60 mg l milligrams per liter as calcium carbonate is classified as soft.
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.
But in short to convert mg l units to gpg divide it by 17 1 and you will get the value you need.
I have a separate article about sizing the softener where i cover the difference between gpg and mg l more in depth.
Enter the value into a calculator and then check that you have entered the value accurately.
Jumping mg l by 17 1 will change it to gpg.
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.
And more than 180 mg l as very hard.
Concentrations of cations in water are expressed in grains per gallon gpg or in milligrams per liter mg l.
General guidelines for classification of waters are.
This is your grains per day number.
What is soft water.
The bottom line is softener always needs to be set against the actual hardness of water and not based on your assumptions.
Establish the hardness value for the water in mg l.
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.
Mg l means milligrams per liter note.
