How to Convert PPM to Grains in Water Hardness

How to Convert PPM to Grains in Water Hardness
••• BananaStock/BananaStock/Getty Images

Tap water may contain dozens of chemicals in addition to water. Some of the dissolved material comes from the rocks in which the aquifer is located. Rocks such as limestone, chalk and calcareous sandstone add polyvalent positively charged ions of calcium and magnesium to the water, causing water hardness. Technicians, scientists and water treatment operators measure water hardness parts per million (ppm) or grains per gallon (gpg). Converting ppm to gpg is simple, but requires a calculator.

    Enter the water hardness value, in parts per million, into the calculator. Double-check the entry to ensure that it is accurate.

    Divide the ppm hardness value by 17.1, the conversion factor for ppm to gpg. The result is the water hardness expressed in grains per gallon. For example, say you have a water hardness value of 180 ppm. Work out

    180 ÷ 17.1 = 10.526

    Round the result to one decimal place, the same degree of accuracy as the conversion factor, and state the units as gpg. For example, using the example in Step 2, write the result as 10.5 gpg.

    Tips

    • Parts per million may also be written as mg/l, or milligrams per liter.

Related Articles

How to Convert Water Hardness in mg/L to GPG
How to Convert Tds to Conductivity
How to Find the Number of Representative Particles...
Conversion of PPM to Micromoles
How to Convert Rockwell Hardness to Tensile Strength
How to Calculate Percent Solids by Weight
How to Calculate the pH of Lemon Juice
How to Convert Metric Tons to Cubic Meters
How to Convert a Durometer to Young's Modulus
What Is the Hardest-Known Metal?
Difference Between Phosphates & Sulphates
How to Make a Five Percent Solution With Salt
How to Test Water Quality for a Science Project
How to Convert Cubic Centimeters to Grains
Conversion of PPM to Oz
How to Calculate the Volume of Voids
How to Convert UG/mL to PPM
How to Make Hard Water
Difference Between Quartz & Calcite

Dont Go!

We Have More Great Sciencing Articles!