Legionella Prevention Technology Facts

Legionella Prevention Technology Facts

  • These are general Legionella prevention technology facts on water treatment technologies used as facility potable water treatment solutions.
  • Some of these solutions are commonly used for Legionella control and prevention within facility potable water distribution networks.
  • We encourage the reader to get the facts that surrounds sort term vs. long terms Legionella control and prevention.

Long-Term Legionella Water Treatment Technologies
Technology:Advantages:Limitations:
Copper Silver
Ionization for Facility Potable
Water
  • Discreet and affordable,
  • 100% for total facility potable water,
  • 100% for domestic hot water loops,
  • Recognized by: The EPA, CDC, WHO, HSE and many other public health authorities,
  • Over 25 years on the market worldwide,
  • Ideal for new construction projects,
  • Installation is fast and easy using standard plumbing,
  • 100% biofilm penetration,
  • 0% pipe corrosion,
  • 66% less expensive compared to short term technologies,
  • 55% smaller footprint than ClO2 (Chlorine Dioxide),
  • 0% use of Ammonia or other dangerous chemicals,
  • 0% byproduct monitoring required (Unlike ClO2)
  • Full Legionella remediation in less than 30 days,
  • Operational in any water temperatures,
  • Operational in any potable water TDS,
  • Operational in most water pH levels, (less than 8.7)
  • No black water (unlike Cl2),
  • No odours (unlike Cl2 and ClO2),
  • No discolouration (unlike Cl2)
  • 100% Legionella isolation in dead legs,
  • Engineered for facility potable water (not swimming pools)
  • Has a 20+ year Legionella control track record,
  • Very easy to install & maintain,
  • Normally includes remote monitoring,
  • AquaLyse® Stainless Steel meets all fire and plumbing codes,(Unlike PVC or CPVC)
  • AquaLyse® Meets all electrical safety codes,
  • AquaLyse® provides full computer control telemetry & data logging,
  • AquaLyse® chamber cell water pressures of up to 820PSI at any liquid temperatures, (Unlike PVC or CPVC)
  • AquaLyse® offers unique "multi-zone" DHW solutions.
  • Not intended for cooling towers,
  • High pH limit of 8.7 (copper starts to precipitate)
  • Some chamber cells do not include water erosion protection,
  • Some controllers still use fuses and not breakers,
  • Technology:Advantages:Limitations:
    Chlorine Dioxide
    (ClO2)
  • Offers Legionella control & prevention in 17 months,
  • Better than Cl2 for long term Legionella control
  • Much less corrosive than Cl2,
  • Better performance than Cl2,
  • Better performance than super heat & flush.
  • Comparable price to Copper Silver Ionisation.
  • 300% Larger footprint than CuAg Ionisation,
  • Strong chlorine odours at production site,
  • Common hardware breakdown & corrosion,
  • Service contracts normally required,
  • ClO2 compounds can be explosive,
  • ClO2 - highly unstable,
  • ClO2 must be generated on site,
  • ClO2 creates chlorites & chlorates byproducts,
  • Legislation ClO2 byproducts monitoring required,
  • Produced by activating sodium chlorite with an oxidizing agent or acid,
  • ClO2 cannot be legally transported,
  • ClO2 decomposes by light,
  • ClO2 decomposes by heat,
  • ClO2 is toxic & irritant,
  • Requires up to 17 months for Legionella control,
  • Reports of blackwater & sludge.
  • Short-Term Remediation Facility Legionella Water Treatment Technologies
    Technology:Advantages:Limitations:
    Chlorination (Cl2)
  • Easy to implement,
  • Limited Legionella remediation effect,
  • Affordable short term strategy,
  • Some short term Legionella control results,
  • Better than thermal eradication,
  • Can be used in both hot and cold water,
  • Shut down water usage,
  • Strong Chlorine odours,
  • Flushing of aLL distal points,
  • 100% flushing can take days / weeks,
  • Pockets of Cl2 stay in the water pipes causing brown/black water,
  • Black water (sludge),
  • Very high ppm (30 to 50ppm),
  • No long term residual effect on biofilm,
  • Re-application every 3 to 5 weeks,
  • High labor costs,
  • Possible plumbing corrosion,
  • At pH 8.5 chlorine requires five times as long to kill bacteria.
  • Technology:Advantages:Limitations:
    Thermal eradication
    AKA Super Heat & Flush
  • Easy to implement
  • Limited Legionella remediation effect
  • Affordable short term strategy
  • Some short term Legionella control results
  • Impractical for cold water pipes
  • Flushing required
  • High risks of scalding
  • No residual effect on Legionella
  • No residual effect on biofilm
  • Short term results
  • Effects only last 3 to 5 weeks
  • High labor costs
  • Only for domestic hot water
  • Research show Legionella presence worsen with continual DHW thermal eradication program
  • Duality Type Legionella Prevention Facility Water Treatment
    Technology:Advantages:Limitations:
    UV can be used in a situation when "technology duality" is required for facility potable water Legionella control & prevention. UV should only be considered for Legionella prevention when a long-term water treatment technology is previously installed.
    Technology:Advantages:Limitations:
    U.V. Lights
    "Ultra Violet"
  • Treats 100% flowing water,
  • No corrosion,
  • No byproducts,
  • Affordable,
  • Easy to Install,
  • Pre-filtration required,
  • Loss of pressure after filtration,
  • No residual (nothing added),
  • No effect on biofilm (where Legionella grows),
  • UV lights must be kept clean,
  • Larger units will use higher amounts of electricity
  • U.V. lights (the rods) burn out,
  • Output UV radiation must be monitored.
  • Not Engineered for Legionella Prevention Facility Water Treatment
    Technology:Advantages:Limitations:
    Swimming Pool Type (Smaller) Copper Silver
    Ionization
  • Ideal for swimming pools,
  • Ideal for fountains,
  • Ideal for spas,
  • Great for home use,
  • Great for some larger swimming pools.
  • Easy to buy,
  • Easy to install,
  • Very affordable,($250 to $2,000)
  • Good algae control in pools,
  • Very small,
  • Not engineered for facility potable water,
  • No automated voltage output,
  • Voltage output set at: 6,12,24 or 48 VDC
  • Low current output of 0.15 to 5.0 amps (rare),
  • Most are copper only electrodes, (No silver)
  • Limited/no automation,
  • Small electrodes,
  • Alloy composition not intended for Legionella control,
  • © Procare Water Treatment Inc. - All Rights Reserved
    AquaLyse® Copper Silver Ionization, manufactured only by Procare Water Treatment Inc., are engineered for long-term facility potable water Legionella prevention and remediation. AquaLyse® units are not engineered or installed in swimming pool applications.

    Legionella Prevention Technology Facts
    Design Stage Facility Projects & Copper Silver Ionization:

    MEP engineering consultant should focus on the long term Legionella prevention water treatment technology facts such as those found with copper-silver ionisation keeping in mind that regular city water chlorination levels will not protect from facility potable water Legionella bacteria colonization.