| Date created: Wed 17 Feb 2010 | File Size: 94 kb | File Time: 13 seconds @ 56 kbps
Description: Disinfection Index – Revised Calculation - Information Letter 3/2006 set out a new water quality measurement, the Disinfection Index, designed to define the stability of the chlorine residual achieved in water leaving a water treatment works, and to compare that stability with a predefined standard.