LEGIONELLA WATER TREATMENT MATRIX MARCH 2013

Disinfection MethodL8 ApprovalOther ApprovalTypeProductionStrengthsWeaknessesEffective ScoreNotes
ThermalYesAllBarrierHeater/CalorifiersEase of UseTemperature compromised Bio-Film Compromised70ACOP L8 states 60°C+ boiler water storage temperature. Best Practice is 70°C. Return temperature in the frame 50-55°C and DDA compomised 44°C. Point of water exit is the compromise point againt best practice.
ChlorineYesAllChemicalElectrolysisEstablished PracticeCoSHH compromised Bio-Film Compromised70ACOP L8 states 6ppm for Legionella control. CoSHH states 4ppm for human exposure. Water mass and pressure variant so ppm cannot be effectively controlled and is thus compromised
Chlorine DioxideYesAllChemicalElectrolysisEstablished PracticeCoSHH compromised Bio-Film Compromised60Health issues with prolonged exposure. Due for HSE and EBR review commences November 2013. Bio-Film integrety is not breached
Calcium HydrochloridePartialPartialChemicalElectrolysisEasily purchased / availableShort active life Bio-Film compromised60Dosing issues. Growing concern as to skin contact issues. Due to face EBR and HSE reveiw from November 2013
Copper -Silver IonisationYes*Yes*BarrierElectrolysisTotal BarrierService Heavy100*Exceptional protection. Requires servicing every 8 weeks
Annolyte - Hypochlorite IonisationYesAllBarrierElectrolysisNear-total BarrieBrine supported90Near-exceptional protection. Brine infusions needed regularly
Anolyte - Catholyte IonisationGermanyPartialBarrierElectrolysisMulti-PurposeExpensive80Wide aquatic pathogenic and bacterial spectrum. Can be used as airborne mist and for surfaces. Drinking water issues dependent on mix.
Silver IonisationPartialPartialBarrierElectrolysisNear-total BarrierBio-Film compromised80ACOP abroad not a full listing in UK. Near-exceptional protection. Requires servicing every 8 weeks. Bio-Film integrity is not breached
Silver Catalised Hydrogen PeroxidePartialAllChemicalElectrolysisEase of useBio-Film compromised80ACOP abroad not a full listing in UK. Bio-Film integrity is not breached

Note * = Use of elemental copper awaiting derogation order in European Union – Expected August 2013