0345 605 0405 info@solidtek.co.uk

multi-storey office facility

Find out how one company had legionella wiped out from its system within just three weeks

 

  • Client: Large facility with prestigious tenants
  • Project Type: Chlortek DS

the problem

  • Issues with hot and cold water services from date of commission
  • Remedial engineered solutions exhausted
  • Legionella analysis of the system over time suggested the system had become colonised with legionella
  • Localised and full system disinfection unable to gain control of legionella
  • Mains fed CWST’s feeding cold water services, CWST fed hot water systems
  • Temperature control generally within control limits

    the solution

    • Secondary disinfection was agreed as only solution to gain control of legionella
    • A number of systems and chemistries considered
    • A Constant Chlor plus Hypochlorous Acid based secondary disinfection delivery system was chosen as solution due to ease of installation & control as well as anticipated performance 
    • ChlorTek DS systems installed (mains injection)
    • Entire system cleaned and disinfected before ChlorTek DS system was commissioned

    the results

    • Extensive sampling demonstrated that hypochlorous acid was reaching all parts of the system at levels known to control planktonic legionella (0.3-0.5ppm free chlorine)
    • Legionella sampling post clean and disinfection and system commission showed control had been obtained and was being maintained by continuous ChlorTek DS secondary disinfection
    • Continued legionella sampling demonstrated that legionella was under control
    • After 8 weeks of clean samples the client requested the systems be switched off
    • Within 1 week legionella sampling showed legionella was present in the system again
    • Two weeks after the systems were switched off the client agreed to switch the systems back on to restore control of legionella
    • Within 2 weeks of switching the systems back on control was improved and within 3 weeks full control was restored
    • After 3 months, legionella sampling was increased across the whole building
    • After 4 weeks of increased sampling, results demonstrated control was excellent – no legionella positive detections in 4 weeks of sampling

    Find out more about the Chlortek ds

    INTERESTED IN BECOMING A DISTRIBUTOR FOR SOLIDTEK?

    SOLIDTEK

    INNOVATION HOUSE
    UNIT 2 BRITONWOOD TRADING ESTATE
    ABERCROMBIE ROAD
    KNOWSLEY INDUSTRIAL PARK
    LIVERPOOL L33 7YN

    0345 605 0405

    INFO@SOLIDTEK.CO.uk