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When dealing with Legionella growth control within a facility potable water network you need to ask yourself this:
  1. Number of domestic hot water "zones" in the building?
    A zone is a totally separate area that has it's own hot water heaters. If two or more zones (loops) come back to one common water heater then this is only 1 zone. If you have totally separate areas with each of them with their own separate hot water heater, then you have multiple domestic hot water zones.
  2. Multiple DHW zones?
    If multiple DHW zones, are any of them in a common mechanical room at less than 20 feet from each other?
  3. Approximate Number of hospital beds or hotel rooms or estimated DHW daily load per Zone?
  4. Size of the outbound and/or return DHW pipes?
List of acceptable potable water Legionella control and prevention technologies
  1. AquaLyse® Copper Silver Ionization (long term)
    Systemic with residual effects. Will treat biofilm to prevent or stop Legionella growth. For long term Legionella growth prevention and remediation in large facility potable water distribution networks . Ideal in hospitals, nursing homes and hotels. Excellent for both domestic cold or domestic hot water loops only. Small footprint, discreet, no smell, no danger, EPA registered http://copper-silver.info
  2. CSIDefender® Copper Silver Ionization (long term)
    For healthcare facility and hotel long term Legionella growth prevention and remediation in large facility potable water distribution networks. Excellent for both domestic cold or domestic hot water loops only. Small footprint, discreet, no smell, no danger, EPA registered http://csidefender.com
  3. Chlorine dioxide (long term)
    Chemical storage and mixing required. Ok for For long term Legionella growth prevention and remediation in large facility potable water distribution networks - hardware issues in most cases. Large area footprint. Requires good service contract for maintenance.
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