Question

Name a naturally occurring substance that removes both temporary and permanent hardness in water.

Answer 1

The process during which water containing ${\mathrm{Ca}}^{2+}$ is filtered through sand named zeolite is named the Permutit process. Permutit may be a zeolite of a man-made source. It is an orthosilicate of sodium aluminium compound with the formula${\mathrm{Na}}_2{\mathrm{Al}}_2{\mathrm{Si}}_2{\mathrm{O}}_8$.

Therefore, Zeolite or Permutit is the naturally occurring substance that removes both temporary and permanent hardness in water.