The Reported Problem
Two undated presentations describe a hospital contamination problem. The following is their account, not a reconstruction of laboratory records.
Ongoing Legionella Contamination
The available presentation summaries describe persistent Legionella pneumophila SG1 in a hospital's hot and cold water systems. Original sampling certificates are not available for verification.
Reported Previous Controls
The summaries say thermal controls and standard flushing had not resolved the problem. Treatment logs and comparative measurements are not supplied.
Biofilm & Ageing Infrastructure
The summaries attribute persistence to biofilm in ageing infrastructure. They do not supply direct biofilm measurements or an engineering investigation to verify that attribution.
Engineering Context Not Verified
The earlier website account described system modifications and pipework renewal. Their dates, scope and contribution to any improvement remain unverified.
The Reported Treatment
The supplied summaries do not include a site-specific treatment protocol. This case is not a dosing instruction or a comparative trial.
Treatment Described in Product Presentations
The hospital narrative appears in presentations about ChloroKlean Plus L20. The original site treatment report is needed to confirm the product, operator, dosing conditions and treatment dates.
Dosing Details Not Independently Verified
The earlier website described continuous proportional dosing from a day tank. No commissioning record, dose log or measured residual series is available to substantiate that description.
A 12-Month Summary Graph
The presentations show months 1–12 and label the later period as non-detectable. They do not establish calendar dates, sampling frequency or an independently verified treatment duration.
What the Summaries Do Not Establish
Biofilm Removal Not Established
A fall in water-sample counts cannot by itself show that biofilm was removed from pipework. Direct measurements would be needed.
Sample Results Are Not System-Wide
Even a verified non-detection result applies to the sample, time and method used. It cannot prove absence throughout a hospital water system.
No Guarantee Against Recurrence
The available summaries do not provide follow-up beyond their 12-month graphs. Ongoing risk assessment, engineering controls and monitoring remain necessary.
Reported Results and Evidence Gaps
Page 9 of each hospital presentation labels the later part of a months 1–12 graph as “Sustained Non-Detectable (ND)”. No underlying results table is supplied. The graphs are not a basis for calculating a percentage reduction or assigning exact readings to individual buildings.
- Baseline and percentage reduction
- No original pre-treatment counts, matched before/after results, calculation method or averaging denominator are available. The two summary graphs differ visually; their bar heights must not be treated as raw data. A 99.99% hospital reduction cannot be verified.
- Locations and sample counts
- The summaries identify hot and cold water systems but give no site name, outlet map, number of samples or sampling protocol. The earlier website's four-building breakdown and Building A–D readings are not substantiated by these documents.
- Detection limits and final readings
- The summaries use “non-detectable” (ND) without a method, tested volume or detection/reporting limit. Non-detection in a sample does not mean an exact 0 CFU/L, nor does it establish system-wide elimination.
- Dates and follow-up
- The graphs show months 1–12, not calendar dates. The earlier mid-January 2024 start and December endpoint are unverified. No dated sampling certificates or follow-up beyond the depicted period are available to assess recurrence.
- Concurrent engineering work
- The earlier website described pipework renewal and system modifications during treatment. No dated work log or treatment record is available to verify their timing or extent, or separate their effects from chemical treatment.
- Biofilm removal and other benefits
- The presentations interpret count fluctuations as biofilm stripping, but provide no direct before/after biofilm measurements. Water-sample counts alone do not demonstrate biofilm removal. Hospital-specific thermal stability, residual consistency and cost savings are also unverified.
Source References and Accessible Summaries
The presentation PDFs are image-based; equivalent descriptions of the relevant evidence and its limitations are provided here as readable text. These historical sources contain claims that this audit does not endorse. They are not current product-use or dosing guidance.
- Regenerative Water Safety Technology — hospital summary (PDF)
Undated presentation, page 9 of 15 (PDF, 9.2 MB). Describes Legionella pneumophila SG1 in hot and cold water systems and labels later months in a 12-month graph as non-detectable. This is a marketing summary, not a laboratory sampling report.
- Regenerative Biocide Technology: Sustained Efficacy — hospital summary (PDF)
Undated presentation, page 9 of 16 (PDF, 9.6 MB). Repeats the hospital narrative with a differently drawn graph. It supplies no underlying sample table and is not independent confirmation of the first presentation.
- Melbec report 56383 — separate EN 13623 laboratory summary (PDF)
Report dated 6 July 2023; test dated 29 June 2023 (PDF, 134 KB). Tests Klarolaks against Legionella pneumophila NCTC 11192 under laboratory suspension-test conditions. The supplied file has only pages 1 and 2 of a report labelled as 3 pages. It is not hospital sampling evidence and does not establish a hospital dose or a ChloroKlean field result.
Documents needed to verify the hospital outcome
Original signed sampling reports and result tables; baseline and follow-up sample dates, outlet locations and counts; laboratory methods, tested volumes and reporting limits; treatment and residual logs; dated engineering-work records; direct biofilm measurements; and post-treatment follow-up. Without these, stronger outcome claims remain unsubstantiated.
Evidence review updated: 29 September 2026. This is a review date, not a sampling date.