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A study found the mean concentration of sodium in softened water to be 278 mg/L. [23] In 2 liters of water—the amount of drinking water typically suggested for an average adult, this constitutes about 22% of the recommended sodium intake by the US CDC and may make a difference to those who need to significantly limit their sodium consumption.
The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm). Also called Clark degree (in terms of an imperial gallon).
In domestic settings, hard water is often indicated by a lack of foam formation when soap is agitated in water, and by the formation of limescale in kettles and water heaters. [2] Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
Water services are provided by the East Peoria Public Works, which services most, if not all of East Peoria homes and businesses. The water is extremely hard, at 28 grains/gallon (roughly 479 mg/L) as calcium. A higher-capacity water softener may be required to adequately soften water of this hardness level. [76] [77]
The definition of water hardness should be included within this article. In North America, water hardness is usually measured in units of gpg or grains per gallon, which is equivalent to the concentration of Ca++ and Mg++ ions in ppm, divided by 17.1. The article later mentions anion resins, and "water softeners" which remove SO4.
Lime softening (also known as lime buttering, lime-soda treatment, or Clark's process) [1] is a type of water treatment used for water softening, which uses the addition of limewater (calcium hydroxide) to remove hardness (deposits of calcium and magnesium salts) by precipitation.
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