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2. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   The membrane has pores large enough to admit water molecules for passage; hardness ions such as Ca 2+ and Mg 2+ will not fit through the pores. The resulting soft water supply is free of hardness ions without any other ions being added. Membranes are a type of water filter requiring regular cleaning or replacement maintenance.

3. The 10 Best Drinking Water Test Kits You Can Order Online - AOL

   www.aol.com/news/7-best-drinking-water-test...

   Quickly and easily test for commonly found pollutants like lead and copper in your home’s drinking water.

4. Lime softening - Wikipedia

   en.wikipedia.org/wiki/Lime_softening

   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.

5. Thomas Clark (chemist) - Wikipedia

   en.wikipedia.org/wiki/Thomas_Clark_(chemist)

   He became known for the discovery of the phosphate of soda, and the process of lime softening of hard water the 'Clark process'. A Clark degree (°Clark) of water hardness is defined as one grain (64.8 mg) of CaCO 3 per Imperial gallon (4.55 litres) of water, equivalent to 14.254 ppm. and 10^5 parts of water

6. 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).

7. Water testing - Wikipedia

   en.wikipedia.org/wiki/Water_testing

   The Ministry has created 24 Water Quality Testing Laboratories across Pakistan, developed and commercialized water quality test kits, water filters, water disinfection tablets and drinking water treatment sachets, conducted training for 2,660 professionals of water supply agencies and surveyed 10,000 water supply schemes out of a grand total of ...