Western Australia, Hard water, Treating water
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On some farms there are ample supplies of water which, although suitable for many domestic purposes, including human consumption, is too "hard" to be satisfactory for washing purposes. Waters are described as "hard" or "soft" depending on the difficulty or ease of obtaining a lather with soap. Not only is it difficult to obtain a lather with soap in a "hard" water but also large quantities of soap curds are formed.
Samuel, L W.
"Treating hard water,"
Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 3
, Article 21.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture3/vol3/iss4/21