28 May Focus OnMulti-Parameter Systems 02 Apr Focus OnSeawater Chlorination 06 Feb Focus OnPID Auto-Tune – why it might not work for water processes 08 Jan Focus OnMeasuring Free Chlorine in the presence of Chlorine Dioxide 11 Dec Focus OnORP for the Removal of Residual Chlorine using Sodium Bisulphite (or other reducing chemicals) 13 Nov Focus OnZero Chlorine123456