Legionella bacteria is usually present in water. The micro organism multiply the place temperatures are between 20-45°C and nutrients can be found. The bacteria are dormant under 20°C and don’t survive above 60°C.
Legionnairesillness is a potentially fatal sort of pneumonia, contracted by inhaling airborne water droplets containing viable Legionella micro organism. Such droplets may be created, for example, by: scorching and chilly water shops; atomisers; wet air conditioning plant; and whirlpool or hydrotherapy baths.
Anybody can develop Legionnairesillness, however the elderly, smokers, alcoholics and those with most cancers, diabetes or chronic respiratory or kidney disease are at more threat.
HSE’s Legionnairesillness web page gives information on managing the dangers
What it’s essential to do
Well being and social care providers should carry out a full risk evaluation of their hot and cold water programs and ensure ample measures are in place to control the risks.
Utilizing temperature management
The primary method used to regulate the chance from Legionella is water temperature control.
Water providers ought to be operated at temperatures that stop Legionella growth:
A reliable particular person ought to routinely examine, examine and clear the system, in accordance with the danger evaluation.
You should establish ‘sentinelretailers (furthest and closest to each tank or cylinder) for month-to-month checking of the distribution temperatures. You also needs to check the new water storage cylinder temperatures each month and cold water tank temperatures a minimum of every six months.
Stagnant water favours Legionella development. To cut back the risk you should remove dead legs/dead ends in pipe-work, flush out infrequently used shops (including showerheads and taps) at the very least weekly and clean and de-scale shower heads and hoses no less than quarterly. Chilly-water storage tanks should be cleaned periodically and water must be drained from hot water cylinders to examine for debris or signs of corrosion.
Design programs to minimise Legionella growth, by:
Water samples ought to be analysed for Legionella periodically to demonstrate that micro organism counts are acceptable. The frequency needs to be determined by stage of threat, in accordance with the danger assessment.
Other management strategies
Different strategies to manage Legionella embrace copper and silver ionisation and biocide remedies (eg chlorine dioxide). To ensure that they stay efficient their application will want appropriate evaluation as part of the general water therapy programme including proper installation, maintenance and monitoring.