Water softening ion-exchange resins are used to replace the magnesium and calcium ions found in hard water. The resin can be regenerated by washing it with salt (NaCl). The calcium and magnesium ions migrate off the resin, being replaced by sodium ions from the solution until a new equilibrium is reached.
Additional Information

Purolite PFC100E Fine Mesh Resin (mono spheric)

Price Per Litre
Packaging:

25L