# 9.4.6 Chlorination as a critical control point: an example

Chlorination is the most commonly used process for disinfection and is highly amenable as a critical control point. Table 9.3 outlines, as an example, the operational requirements relevant to the chlorination process as a critical control point. The requirements include monitoring the key operational characteristics of residual chlorine concentration, flow rate (contact time) and chlorine dose; and establishing critical limits and target criteria for effective operation. Turbidity, temperature and pH also require monitoring, as they influence chlorination effectiveness and the validity of C.t calculations. Corrective actions to address deviations in operating limits must be identified, and chlorination performance should be regularly verified.

Appendix A1.8 provides additional information on chlorination as a critical control point.

### Table 9.3 Example of chlorination as a critical control point <a href="#table-9-3" id="table-9-3"></a>

<figure><img src="/files/s7neX7uFYJXRIMVRKWZm" alt=""><figcaption><p>Click for a larger version. An accessible copy of this table and a high quality PDF is available at <a href="https://www.nhmrc.gov.au/australian-drinking-water-guidelines-resources#Table93">Water Quality Guidelines resources</a>.</p></figcaption></figure>

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