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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).

3. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes

4. Gpg4win - Wikipedia

   en.wikipedia.org/wiki/Gpg4win

   The original creation of Gpg4win was initiated and funded by Germany's Federal Office for Information Security (BSI) in 2005, [2] [3] resulting in the release of Gpg4win 1.0.0 on 6 April 2006; [4] however Gpg4win and all included tools are free and open source software, and it is typically the non-proprietary option for privacy recommended [5] [6] to Windows users.

5. GPG - Wikipedia

   en.wikipedia.org/wiki/Gpg

   GPG. 6 languages. Català ... Grains per gallon, water hardness measurement; The Good Pub Guide, recommends pubs in the UK; Generalized Petersen graph, ...

6. EPA WaterSense - Wikipedia

   en.wikipedia.org/wiki/EPA_WaterSense

   Specifications for pre-rinse spray valves and water softeners started development as of 2011. [8] [9] In June 2014, WaterSense began the certification of homes, designed to use 20% less water than standard new construction, as well as the accreditation of irrigation professionals for the installation, maintenance, design and auditing of systems ...

7. Hard water - Wikipedia

   en.wikipedia.org/wiki/Hard_water

   A common method for water softening involves the use of ion-exchange resins, which replace ions like Ca 2+ by twice the number of mono cations such as sodium or potassium ions. Washing soda (sodium carbonate, Na 2 CO 3) is easily obtained and has long been used as a water softener for domestic laundry, in conjunction with the usual soap or ...