parts per million – Water Testing Blog & Water Test Kit Store http://watertestingblog.com "It's your water, your health.. and ultimately your LIFE!" Thu, 30 Dec 2021 07:33:30 +0000 en-US hourly 1 https://wordpress.org/?v=4.7.5 Hardness: Grains per Gallon (GPG) vs. Parts per Million (PPM) http://watertestingblog.com/2009/01/14/hardness-grains-per-gallon-gpg-vs-parts-per-million-ppm/ http://watertestingblog.com/2009/01/14/hardness-grains-per-gallon-gpg-vs-parts-per-million-ppm/#respond Wed, 14 Jan 2009 07:06:32 +0000 http://watertestingblog.com/2009/01/14/hardness-grains-per-gallon-gpg-vs-parts-per-million-ppm/ 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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