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Legionella bacteria enter water systems through mains water. They breed and live in biofilm. Through being transported by the flowing water to outlets Legionella bacteria can cause illness such as Legionnaires disease.
Being electrically charged the copper and silver ions seek opposite polarity and find this in Legionella bacteria as well as those breeding in biofilm.
The copper and silver ions attach, through electrostatic bonds, to negatively charged sites on bacterial cell walls. This distorts and weakens the cell wall allowing penetration of the silver ions. The silver ions attack the cell by binding at specific sites to DNA, RNA, cellular protein and respiratory enzymes denying all life support systems to the cell causing lysis and death. (References: Britton G and Freihofer V., 1978 & Friedman B A and Dugan P R., 1968 & Slawson et al, 1990 & Thurman R B, Gerba C P, 1989).
The copper and the silver ions need to work together. Without the copper ions the silver ions cannot penetrate the cell wall of the target organisms.
ProEconomy have been analysing water since 1993 and have built up substantial data on results. This data shows that where silver and copper ion concentrations are maintained at outlets at between 0.02 and 0.08 mg/l and at between 0.2 and 0.4 mg/l respectively, Legionella contamination is avoided and controlled.
Short film on how the Orca system works
Legionella bacteria