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Drinking hard water may have moderate health benefits. ... The total water hardness is the sum of the molar concentrations of Ca 2+ and Mg 2+, in mol/L or mmol/L units.
Drinking water quality standards describes the quality parameters set for drinking water. ... Pesticides 0.50 μg/L total; ... hardness CaCO3 0–75 mg/L = soft 300 mg/L
Carbonate hardness, is a measure of the water hardness caused by the presence of carbonate (CO 2− 3) and bicarbonate (HCO − 3) anions. Carbonate hardness is usually expressed either in degrees KH (from the German "Karbonathärte"), or in parts per million calcium carbonate ( ppm CaCO 3 or grams CaCO 3 per litre|mg/L).
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).
The International Organization for Standardization (ISO) published [when?] regulation of water quality in the section of ICS 13.060, [57] ranging from water sampling, drinking water, industrial class water, sewage, and examination of water for chemical, physical or biological properties. ICS 91.140.60 covers the standards of water supply systems.
Drinking water or potable water is water that is safe for ... of total water per day for women and 2.5 litres (88 imp ... often rendering the water "soft" or "hard".
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