Legionella Control in Cooling Towers

Evaporative Cooling towers are an effective method of cooling a constant flow of water. We are all aware of the potential hazards that can arise from using cooling towers, above all the risk of a legionella outbreak.

The majority of cooling tower users utilise chemical dosing as a method of controlling legionellosis. However, the use of chemical dosing alone has it pitfalls.

Chemical dosing may kill any living organisms but what happens to the dead bacteria?

Dead bacteria organisms along with particulate from pipework, components and the environment form an excellent source of nutrition for new organisms.

HSE guidance directive states that the proliferation of organisms may be avoided by:-

“Keeping the system clean so as to avoid the build-up of sediments etc, which may harbour bacteria or provide a nutrient source for them.”

This is where Filtration comes in. With the correct filtration technology, particulate down to <1.0 micron will be removed from the system preventing the build-up of sediment and biofilm (a bacteria breeding ground.)

Hydro-Gen Engineering Ltd supply self-cleaning filtration technology tailored for this requirement.

Additional advantages of Filtration supplied by Hydro-Gen Engineering Ltd include:-

  • Reduction in production down time taken for cleaning and maintenance work.
  • Reduction in levels of Chemical dosing (reduced costs)
  • Increase in overall efficiency of cooling systems (reduction in curing time required)leading to an increase in production.
  • Increased level of control over potential hazards and peace of mind.

If you are interested in the safe guard and cost reduction of your cooling water system please feel free to contact us and we would be happy to discuss this with you.

Produced by Hydro-Gen Engineering Ltd.



Extract taken from “The control of Legionellosis including Legionnaires disease” Health and Safety series booklet HS(G)70.

Copyright 2013 Hydro-Gen Engineering Ltd

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