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Reverse osmosis is also called hyperfiltration because it removes

  • A.only particles larger than a micrometre
  • B.only the ions of calcium and magnesium
  • C.only dissolved gases from the water
  • D.ionic, molecular and colloidal matter alike

Answer: D

The membrane's rejection extends down to individual ions, which no conventional filter approaches, and it holds back bacteria and dissolved organic matter as well. Its main operating problems are fouling and scaling of the membrane surface.

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