Comments on: Determination of chemical oxygen demand of water http://hardsoftwater.com/determination-of-chemical-oxygen-demand/ Hard and soft water provides information on water filter, softener and water purification or treatment systems Sat, 26 Mar 2022 09:57:09 +0000 hourly 1 https://wordpress.org/?v=6.9 By: MANTASHA ANSARI http://hardsoftwater.com/determination-of-chemical-oxygen-demand/#comment-158671 Sat, 26 Mar 2022 09:57:09 +0000 http://hardsoftwater.com/?p=451#comment-158671 i can’t understand the calculation part

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