Formula to measure no of grains to be removed.
Water hardness grains vs mg l.
Ppm and mg l are the same thing.
Grains per gallon is the business standard approach for talking about water hardness.
Hardness is usually expressed in grains per gallon or ppm as calcium carbonate equivalent.
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.
Different agencies and organizations may use slightly different classifications when discussing water hardness.
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.
Jumping mg l by 17 1 will change it to gpg.
Typically water that contains less than 1 grain per gallon is.
The hardness of high quality water should not exceed 270 mg l 15 5 grains per gallon measured as calcium carbonate.
Symptoms of hard water include.
Enter the value into a calculator and then check that you have entered the value accurately.
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.
121 to 180 mg l as hard.
The bottom line is softener always needs to be set against the actual hardness of water and not based on your assumptions.
And more than 180 mg l as very hard.
Hardness is caused by compounds of calcium and magnesium and by a variety of other metals.
Establish the hardness value for the water in mg l.
Concentrations of cations in water are expressed in grains per gallon gpg or in milligrams per liter mg l.
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.
I have a separate article about sizing the softener where i cover the difference between gpg and mg l more in depth.
Multiply the answer by your water hardness in grains per gallon to convert mg l or ppm to grains divide by 17 1.
If hardness is in mg l or ppm convert it into gpg by dividing it with 17 1.
This is your grains per day number.
Mg l means milligrams per liter note.
0 to 60 mg l milligrams per liter as calcium carbonate is classified as soft.
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.
61 to 120 mg l as moderately hard.
