How the Orca water ionisation system compares.

Looking-at-taps-2.jpgUnlike all other technique, the Orca copper and silver ionisation system destroys biofilm.

  • Biofilm is a slimy layer that rapidly forms on the inside of pipework and allows Legionella to multiple to high levels within it. 
  • Biofilm is the largest source of Legionella bacteria and complete water systems can become colonised within it.
  • Chemical treatments such as chlorine dioxide and heat treatments do not penetrate it.

UV, ultrasound, filtration and chemical water ionisation treatments have very short-term residual effects, whilst the Orca copper and silver ionisation system has a long-term residual effect.

  • The Orca water treatment system will remain actively fighting bacteria over large distances and for long periods of time.
  • The Orca Legionella control system has been proven to be effective for months after the system has been turned off.

UV, ultrasound and filtration are only effective at the place of contact; the Orca copper and silver ionisation system can destroy Legionella even in stagnant water, since the copper and silver ions are active until they are ‘consumed’.

Below is a table detailing how copper and silver water ionisation compares to other water treatment methods:

Parameters Copper and Silver Ionisation Continuous Chlorination Heat and Flush Chlorine Dioxide Ultra Violet Light (U.V.)
Concentration required at outlets Cu = 0.2 - 0.8 mg/l

Ag = 0.02 - 0.08 mg/l
2 - 4 mg/l as free chlorine 80°C for 30 min 0.5 - 1 mg/l as CLO2 300 nm
On-site efficacy documented in literature Yes Yes Yes Yes Yes
Residual effect Yes No No More stable than Chlorine No
Time to re-colonization 6 - 12 weeks 1 - 2 weeks Varies No information available Only works at point of entry
Temperature Residuals unaffected by high temperature Residuals decrease as temperature increases NA Residuals decrease as temperature increases Only works at point of entry
pH Elevated pH (>8.5) may affect efficacy Elevated pH (>8.5) affect efficacy No effect No effect No effect
Disinfection by-product None known Trihalomethane (THMs) Chlorate and Chlorite sdf None
Taste and odours None Yes No Minimal at high concentrations None
Pipe corrosion Non observed Highly corrosive Old pipe may be affected Corrosive None
Maintenance issues Routine ion monitoring

Routine inspection of electrodes
COSHH Applies

Concentration control and monitoring

Corrosion control
Scalding possible

Labour intensive
COSHH Applies

Concentration control and monitoring

Corrosion control
Routine cleaning
Efficacy issues None Does not penetrate biofilm

Loses efficacy at elevated pH. Decays at elevated temperature and over distance
Does not penetrate biofilm

Legionella bacteria only lay dormant below 20°C and above 60°C
Decays at elevated temperature and over distance Can only be effective at point of entry

Does not work with shadows