S.L. 465.3 Art. 9Maintenance and testing of cooling tower systems and evaporative condensers. Water quality and treatment. Disinfection, cleaning and re- disinfection. Routine inspections and testing. Microbiological sampling frequency. Water sampling.

It shall be the duty of the responsible person to ensure that:

(a) any cooling tower system or evaporative condenser in use is maintained and tested in accordance with the guidelines;

(b) the water of the cooling tower system or evaporative condenser is maintained in a clean condition;

(c) the water of the cooling tower system or evaporative condenser is continuously treated with:

(i) one or more biocides to effectively control the growth of micro-organisms, including Legionella; and

(ii) chemicals or other agents to minimise scale formation, corrosion and fouling;

(d) a chlorine-compatible bio-dispersant is added to the recirculating water of the cooling tower system or evaporative condenser, and that the system is then disinfected, cleaned and re-disinfected:

(i) immediately prior to initial start up following commissioning, or any shut down period of greater than one month; and

(ii) at intervals not exceeding six months;

(e) the cooling tower system or the evaporative condenser are inspected in accordance with the guidelines and

Schedule 1;

(f) at least once every month take a sample of the recirculating water of the cooling tower system and the evaporative condenser to an accredited laboratory for testing for heterotrophic colony count and once every six months for legionella;

(g) a water sample shall be taken before the dosing of biocide and in accordance with the guidelines.