What is Calgon,used for softening water?

  • A
    $Na_2[Na_4(PO_3)_6]$
  • B
    $Na_4[Na_2(PO_3)_6]$
  • C
    $Na_2[Na_4(PO_4)_5]$
  • D
    $Na_4[Na_2(PO_4)_6]$

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