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2. Foundry sand testing - Wikipedia

   en.wikipedia.org/wiki/Foundry_sand_testing

   Foundry sand testing is a process used to determine if the foundry sand has the correct properties for a certain casting process. The sand is used to make moulds and cores via a pattern . In a sand casting foundry there are broadly two reasons for rejection of the casting — metal and sand — each of which has a large number of internal ...

3. Swimming pool sanitation - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool_sanitation

   Over time, calcium from municipal water tends to accumulate, developing salt deposits in the swimming pool walls and equipment (filters, pumps), reducing their effectiveness. Therefore, it is advised to either completely drain the pool, and refill it with fresh water, or recycle the existing pool water, using reverse osmosis. The advantage of ...

4. Permeability (foundry sand) - Wikipedia

   en.wikipedia.org/wiki/Permeability_(foundry_sand)

   The grain size, shape and distribution of the foundry sand, the type and quantity of bonding materials, the density to which the sand is rammed, and the percentage of moisture used for tempering the sand are important factors in regulating the degree of permeability.

5. dGH - Wikipedia

   en.wikipedia.org/wiki/DGH

   Since CaO has a molar mass of 56.08 g/mol, 1 dGH is equivalent to 0.17832 mmol per litre of elemental calcium and/or magnesium ions. In water testing hardness is often measured in parts per million (ppm), where one part per million is defined as one milligram of calcium carbonate (CaCO 3 ) per litre of water.

6. Marine biogenic calcification - Wikipedia

   en.wikipedia.org/wiki/Marine_biogenic_calcification

   Marine biogenic calcification is the production of calcium carbonate by organisms in the global ocean.. Marine biogenic calcification is the biologically mediated process by which marine organisms produce and deposit calcium carbonate minerals to form skeletal structures or hard tissues.

7. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   It shows sodium ions being released by the resin, and replaced with calcium ions captured from water. 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