Noun
a substance (such as sodium chloride) that lessens the hardness of water by replacing calcium and magnesium ions with sodium ions and so gives the water more efficient sudsing power
Source: WordNetWe actually put a water softener in our home because our city water is so hard. Source: Internet
You cannot just install a water softener system and forget about it; it will certainly help, but it doesn’t remove the iron, zinc, magnesium, copper and lead that cause skin issues, since the dissolved particle can be microscopic. Source: Internet