permanent hardness – Hard and Soft Water http://hardsoftwater.com Hard and soft water provides information on water filter, softener and water purification or treatment systems Tue, 21 Jun 2016 11:53:34 +0000 en-US hourly 1 https://wordpress.org/?v=6.9 61943100 Determination of permanent hardness of water http://hardsoftwater.com/determination-of-permanent-hardness-of-water/ http://hardsoftwater.com/determination-of-permanent-hardness-of-water/#respond Wed, 22 Jun 2016 13:00:24 +0000 http://hardsoftwater.com/?p=395 The available methods for determination of permanent hardness of water are O’Heners method, EDTA method and Soap titration method. Initially we have to know; what is hardness? –Hardness is due to presence of bicarbonate, sulphates, chlorides and nitrates of calcium …

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