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UKWater softener
/wˈɔːtə sˈɒfənə/
/wˈɔːɾɚ sˈɔfənɚ/Water softener
[NOUN]1
a device that removes minerals, such as calcium and magnesium, from hard water to make it soft and more suitable for household use
2
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