Point of Entry Legionella Control: Filtration and UV Systems

Point of Entry (POE) systems are an effective strategy for managing Legionella bacteria in building water systems. By treating water as it enters a facility, these systems help to mitigate and prevent the spread of Legionella throughout the piping. Point of Entry systems simplify Legionella control by addressing the problem at the source – where water enters the building. This approach reduces the risk of Legionella spreading through plumbing systems, minimizing the potential for outbreaks. POE systems are especially valuable for high-risk environments such as hospitals, senior living facilities, and large commercial properties with complex water systems.

One notable advantage of utilizing POE filters is that they also filter the food sources that Legionella necessitates for its survival. This augments the effectiveness of micron-level filtration, despite the bacteria’s smaller size compared to the filter’s pore size. Consequently, it becomes an indispensable component of your comprehensive Legionella mitigation strategy.

Two commonly used methods in POE systems are filtration and ultraviolet (UV) disinfection, which can work independently or in tandem to ensure water safety.

Filtration for Legionella Control

Filtration systems provide a physical barrier to contaminants, capturing Legionella bacteria, critical food sources for the bacteria as well as other waterborne pathogens such as NTM and Pseudomonas.  Filters used in these applications can filter down 0.2 microns or even smaller, helping to ensure that even very small bacteria are removed.  Charged membrane filters (CMF) have the added benefit of attracting Legionella and other gram-negative bacteria with a small charge in the filter media.

In addition to trapping bacteria, filtration also removes sediment, rust, and other particulates that can contribute to water quality issues, food supply or provide a habitat for microbial growth. This makes filtration particularly valuable in facilities with older plumbing systems or water supplies prone to sedimentation or pressure changes. The key benefits are:

• Reducing bacterial load entering the system
• Improving overall water clarity and quality
• Facilitating easy integration with other treatment systems
• Increasing efficacy of any disinfectants like chlorine or monochloramines in the water

UV Disinfection for Legionella Control

UV disinfection uses ultraviolet light to neutralize Legionella, NTM, Pseudomonas bacteria by disrupting their DNA. This prevents the bacteria from reproducing or causing harm. UV systems treat water as it flows past a UV lamp, offering instantaneous and continuous disinfection.

Unlike chemical treatments, UV disinfection doesn’t alter the water’s taste, odor, or composition, making it a preferred choice for facilities seeking chemical-free solutions. When paired with point of entry filtration, UV systems are even more effective, as particulate-free water allows the UV light to penetrate and treat pathogens more thoroughly. Key benefits include:

• Providing immediate and chemical-free disinfection
• Killing or inactivating Legionella and other harmful microorganisms.
• Requiring minimal ongoing maintenance beyond lamp replacements.

The Best POE Solution: Combining Filtration and UV for Improved Legionella Control

While each technology is effective on its own, combining filtration and UV disinfection often delivers the best results. Filtration removes debris and food sources that can shield bacteria from UV light, while UV ensures that any microorganisms bypassing the filter are neutralized. This combination provides comprehensive water treatment at the point of entry, ensuring safer water throughout the building.

Work with an Independent Legionella Consultant

Choosing the right POE system depends on factors such as water quality, facility size, and maintenance capabilities. Consulting with an independent Legionella control expert can help identify the most effective solution for your specific needs, whether that involves filtration, UV disinfection, a combination of both, or an alternative solution like supplemental disinfection such as mixed oxidant, chlorine dioxide, or copper-silver ionization. Contact the independent Legionella experts at Legionella Control Systems to determine the best approach for your facility and budget. Legionella Control Systems combines engineering skills with Legionella expertise to give you a solution you can trust.