Water softening based upon ion-exchange (with salt):
Details concerning the principle: please refer to the link:
NaCl (=Salt) reacts with the lime
dissolved in water and is divided into Na (=Sodium)
and Cl (=Chloride):
Na (=Sodium) is released into the de-mineralised
drinking water and represents a further loading
material for the organism (the legal limit
in Southern Germany is: 150 mg sodium / l).
Cl (=Chloride) reacts with lime
and becomes to the even harder Calcium-Chloride:
This way, the problem of the hardening
ions (calcium and magnesium) is aggravated
and shifted back into the sewer
and, therefore, into the purification plants.
For this reason water softening devices based upon ion-exchange
(with salt) are no longer approved in regions with high
levels of water hardness (i.e. those with much lime).
A not recommendable solution for water
softening which is recognized meanwhile even by authorities