What is $Calgon$,used as a water softener?
- 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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