Biocide dosing remains difficult.
Despite the sums above and large amounts of research on various biocides being available, the actual choice and effectiveness of biocides is still very variable. It is still not possible to predict why a part cular biocide may work in some situations and not in others. Cost-effective biocide dosing in the field remains a "black art". It is important to check that the biocide programme is appropriate for the particular cooling system. It is essential that the reasons for using a particular programme are documented (notes will possibly be sufficient). If the programme is ineffective, then investigations into why it is not working are made so that any remedial action is taken rapidly. If the remedial action taken s not effective, further options can be tried. The monitoring of biocides and bacterial control is an extremely important aspect of an effective water treatment programme.