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Jan
14

Hardness: Grains per Gallon (GPG) vs. Parts per Million (PPM)

Water Testing BlogHardness, Water Testing

Question: When looking at measurements of ‘hardness’, what is the difference between Grains per Gallon (GPG) and Parts per Million (PPM)?

Answer: Both units of measurement refer to the amount of hardness in the water tested. Simply put, multiplying a GPG hardness reading by 17.1 will tell you what the hardness is in PPM and conversely, dividing a PPM hardness reading by 17.1 will yield the hardness in GPG.

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comments (2)

  1. Popular Water Testing Blog Posts: July 2009 | Drinking Water Quality, Testing, Filters and Purification Says:
    August 1st, 2009 at 11:20 am

    [...] Hardness Grains per Gallon vs. Parts per Million: Once again, the name says it all. What more can we say about this posting dealing with water hardness measurement scales. [...]

  2. Question: What are the Most Commonly Tested Water Parameters? | Water Quality: Testing, Filters for, and Purification of Drinking, Ground and Pool Water Says:
    January 31st, 2010 at 5:42 pm

    [...] Hardness: Grains per Gallon vs. Parts per Million [...]

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