The Problem: A Persistent Health Risk
The hospital faced ongoing challenges with Legionella contamination that traditional methods couldn't resolve.
Ongoing Legionella Contamination
The hospital experienced frequent positive results for Legionella Pneumophila SG1, posing an immediate risk to patients.
Traditional Treatments Were Failing
Regular maintenance, temperature controls, and remedial flushing with sodium hypochlorite were insufficient to control the bacteria.
Root Causes: Biofilm & Ageing Pipes
Persistent biofilm provided a safe habitat for Legionella to proliferate, worsened by ageing system infrastructure and poor water distribution.
Urgent Need for a New Solution
A new approach was required to mitigate risk during significant system modifications and pipework renewal.
The Solution: Advanced Disinfection
Severn Trent Services implemented a comprehensive treatment program using ChloroKlean® Plus L20.
Introducing ChloroKlean Plus L20™
Severn Trent Services treated the facility's water with ChloroKlean Plus L20™, a specialized chlorine dioxide technology.
Proportional Dosing System
The disinfectant was continuously applied to all hot and cold water services, dosed proportionally to water use from a day tank.
12-Month Treatment Program
The solution was employed for a full year, proving its effectiveness even during major planned remedial works across the hospital.
The Benefits: Effective & Reliable Control
Superior Biofilm Penetration
Using chlorine dioxide technology, ChloroKlean Plus L20™ successfully broke down and removed the persistent, existing biofilm that was protecting the Legionella bacteria.
Effective in Hot Water Systems
It demonstrated improved thermal stability compared to sodium hypochlorite, resulting in effective control of Legionella in the hot water system.
Cost-Efficient & Consistent Control
The solution provided stable disinfectant residuals, eliminating the need for repeated and disruptive sodium hypochlorite shock treatments.
The Results: Data-Driven Legionella Eradication
Monthly samples taken after dosing began in mid-January 2024 show the progressive eradication of Legionella Pneumophila SG1.
12
Months to Complete Eradication
99.99%
Average Bacterial Reduction
4
Buildings Treated Successfully
0
CFU/L Final Reading All Buildings
Building A
0
CFU/L (Dec)
Building B
0
CFU/L (Dec)
Building C
0
CFU/L (Dec)
Building D
0
CFU/L (Dec)
Legionella Counts Dramatically Reduced: All four buildings achieved complete eradication of Legionella Pneumophila SG1 within the 12-month treatment period.
"Using ChloroKlean Plus L20™ we have been able to manage the risk of Legionella proliferation within the water system while identifying and remediating the underlying causes of the colonization."
- Head of Technical Services