Water tank disinfection & cleaning

Domestic, Commercial and Industrial water systems are fed from dedicated water storage tanks that in turn are fed from local water supply systems. Contaminated or dirty water is potentially a very severe health hazard, badly maintained water storage tanks are a major contributory factor. All water tanks and the associated pipelines must be regularly inspected, maintained, cleaned and disinfected in line with local and International standards.

• Water systems have to be kept clean to reduce the nutrients available for bacteria growth. Regular visual inspections should be made at least every month to avoid the build-up of dirt, organic matter or other debris.
  
• All water systems which create a water spray or aerosol, and Spa pools must be treated and maintained to minimize the risk of Legionella bacteria contamination.

Along with any disinfection methods of treatment used, the following are recommendations to reduce of the incidence Legionella contamination within domestic plumbing (hot and cold) water systems:

• Water systems (hot & cold water) must be flushed with water of not less than 70 °C for 5 minutes (minimum of 60 °C) measured at the outlets. Or
• Treated with chlorine to provide minimum free chlorine residual of 1-2 mg/l at all outlets.

Inspecting and cleaning a (hot and cold) water system

Water systems (hot & cold water) must be flushed at least every six months with water of not less than 70 °C for 5 minutes (or an equivalent temperature/time combination) or treated with chlorine to provide minimum free chlorine residual of 1-2 mg/l at all outlets.

• Reduce dead legs (stagnant lines and stubs) in the system,
• Clean and inspect hot water tanks regularly – annually as a minimum,
•  Continually run hot water circulation pumps – avoid recycling to mixing valves only,
•  Store hot water at a minimum temperature of 60 °C (140 °F) and deliver to the taps at a minimum temperature of 50 °C (122 °F),
• Store and distribute the cold domestic water below 20 °C (68 °F) – if not possible , then consider monitoring of Legionella and using a disinfection system if Legionella are not under control,
• Flush the entire water system on a regular basis (at least quarterly),
• Consider routine treatments – including the use of approved biocides.

NOFM is an approved and certified company to clean any type or size of water tank system.