Calgon is
Sod aluminium silicate
Calcium silicate
Polyphosphate
Poly sulphates
As we lerant in
Permanent Hardness -
Such hardness is due to calcium or magnesium chloride and sulphate.
- wherein
It can be removed by
1) Calgon's method
2) Ion exchange method
Calgon is the common name for the complex salt Sodium hexa meta phosphate (NaPO3)6 .So it is ployphosphate.
Option 1)
Sod aluminium silicate
This option is incorrect.
Option 2)
Calcium silicate
This option is incorrect.
Option 3)
Polyphosphate
This option is correct.
Option 4)
Poly sulphates
This option is incorrect.