The capacity of water to consume soap, chiefly because of dissolved calcium and magnesium ions. Quantitative results are commonly expressed as a calcium carbonate equivalent; this does not mean all the hardness originally existed as dissolved calcium carbonate.
A historical quantitative test in which a standardized soap solution is added to a measured water sample until a specified persistent lather appears. A reagent blank accounts for the amount needed to form the lather itself.

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  1. Water quality
  2. Public health
  3. Medicine
  4. Biology
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