water softener

Noun
  1. 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 (synset 115080679)
    is a type of: softener - a substance added to another to make it less hard
    subtypes: zeolite - any of a family of glassy minerals analogous to feldspar containing hydrated aluminum silicates of calcium or sodium or potassium; formed in cavities in lava flows and in plutonic rocks

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