What does a water softener do?
A water softener facilitates the removal of calcium, magnesium, and certain other metal
cations in hard water. The resulting soft water is more compatble with soap and extends
the lifetime of plumbing. Water softening is usually achieved using lime softening or ion-
exchange resins. The presence of certain metal ions in water causes a variety of problems.
These ions interfere with the action of soaps. they also lead to build up of limescale,
which can foul plumbing, and promote galvanic corrrosion.