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2. Grain per gallon - Wikipedia

   en.wikipedia.org/wiki/Grain_per_gallon

   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).

3. Hard water - Wikipedia

   en.wikipedia.org/wiki/Hard_water

   Water hardness is often not expressed as a molar concentration, but rather in various units, such as degrees of general hardness , German degrees (°dH), parts per million (ppm, mg/L, or American degrees), grains per gallon (gpg), English degrees (°e, e, or °Clark), or French degrees (°fH, °f or °HF; lowercase f is used to prevent ...

4. Grain (unit) - Wikipedia

   en.wikipedia.org/wiki/Grain_(unit)

   [14] [15] Otherwise, water hardness is measured in the dimensionless unit of parts per million (ppm), numerically equivalent to concentration measured in milligrams per litre. [14] [15] One grain per U.S. gallon is approximately 17.1 ppm. [14] [note 1] Soft water contains 1–4 gpg of calcium carbonate equivalents, while hard water contains 11 ...

5. Carbonate hardness - Wikipedia

   en.wikipedia.org/wiki/Carbonate_hardness

   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).

6. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...

7. The 7 Best Laundry Detergents for Hard Water - AOL

   www.aol.com/entertainment/7-best-laundry...

   First up on our list of the 7 best laundry detergent for hard water is Loni Bio Laundry Detergent. This fragrance free option comes in a 75 washer load option that uses natural ingredients and ...

8. Hardness scales - Wikipedia

   en.wikipedia.org/wiki/Hardness_scales

   Hardness scales may also refer to: Methods of measuring the deposit formation by hard water. The scale of Pencil hardness This page was last edited on 11 ...

9. Norovirus cases are surging. A doctor explains what to look for

   www.aol.com/norovirus-cases-surging-doctor...

   The key is to try to keep down fluids to prevent dehydration, which can be a common side effect. Adults should drink water and most other fluids, including juice and sports drinks. Children can ...