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Biofilm & Chlorine Dioxide Learning Hub

A curated, evidence-led guide to biofilm structure, disinfectant tolerance and practical hygiene contexts. General published chlorine-dioxide research is not a claim about ChloroKlean products or a substitute for product labels and site-specific advice.

Explore the biofilm guides

Start with the fundamentals, then move to the application context most relevant to your system.

Chlorine Dioxide, Shigella and Produce Wash Water: What the Evidence Shows

A careful reading of the Shigella flexneri chlorine dioxide study, including its biofilm, VBNC-like and simulated broccoli wash-water findings.

What Is Biofilm?

Biofilm is a surface-associated community of microorganisms embedded in a self-produced matrix. It can develop on wetted surfaces where conditions support

Planktonic Bacteria vs Biofilm

Planktonic bacteria float in water; biofilm cells attach to surfaces. Learn why a clear water sample cannot rule out biofilm in pipework.

What Is EPS in Biofilm?

EPS is the extracellular polymeric substances matrix around biofilm cells. Learn what it contains, how it affects treatment contact and what studies cannot

Chlorine Dioxide and Biofilm: What the Evidence Shows

Published studies examine chlorine dioxide against biofilms in particular laboratory and applied settings. Those findings support scientific discussion, bu

Disinfectant Residuals and Biofilm Control

How residual, temperature, biofilm ecology and DBPs fit together, with limits from 2026 Valencia and US building studies.

Mixed-Species Biofilms and Disinfectant Tolerance

Many operational biofilms contain more than one organism. Interactions between organisms and the surrounding matrix can complicate laboratory-to-site compa

Hot Tub and Spa Biofilm

Warm, recirculating spa systems require attentive hygiene management because bather loading, aeration, filters and complex plumbing can create demanding op

Cooling-Water Biofilm and Legionella Risk

In evaporative cooling systems, biofilm and deposits are relevant to Legionella risk management, but control requires the full risk-assessment and written-

Disinfectant Depletion and Regrowth in Waterlines: What the 2026 Dental Study Shows

Narrow-bore polymer waterlines consume chlorine dioxide within hours, and a 2026 dental waterline study shows how that depletion turns a one-off shock into

Chlorine Dioxide and Reverse-Osmosis Membrane Compatibility

Chlorine dioxide is used upstream of reverse-osmosis systems for biofouling control, but 2026 laboratory studies show that polyamide membranes are not immu

Why Chemical Disinfection Alone May Not Remove Biofilm

Killing cells in a biofilm and removing the biofilm are different outcomes. A 2026 food-surface study found that sodium hypochlorite on its own left biofil

How Chlorine Dioxide Damages Bacterial Cells: Thiol Oxidation and Oxidative Stress

Chlorine dioxide inactivates bacteria mainly by oxidising sulphur-containing and aromatic amino acids in proteins, with cellular thiols an early target. A

Viable but Non-Culturable (VBNC) Bacteria After Disinfection

A negative culture result after disinfection shows that the organisms sampled did not grow on the test medium. It does not on its own prove they were elimi

Biofilm Monitoring and Verification: What the Evidence Can and Cannot Show

How to combine water and surface evidence, using a 2026 Valencia study of temperature, free chlorine, biofilm ecology and DBPs.

Biofilm in Poultry and Pig Drinking Lines

Drinking-water lines in broiler houses and pig nurseries run warm, slow and nutrient-rich, and a 2026 Belgian survey found biofilm on their internal surfac

Mixed-Species Dairy Biofilms: Why Single-Species Tests Can Understate Resistance

Dairy plant biofilms are rarely one organism. A 2025 npj Science of Food study found that Staphylococcus aureus and Pseudomonas fluorescens grown together

Dental Unit Waterline Biofilm: UK Guidance and Evidence

Why dental unit waterlines form biofilm, what HTM 01-05 expects and why a one-chair chlorine dioxide study cannot set a ChloroKlean dose.

Healthcare Surface Biofilms and Chlorine Dioxide: Reading the 2025 Journal of Hospital Infection Study

Dry-surface biofilm on hospital equipment and near-patient surfaces is now recognised as a reservoir for multidrug-resistant organisms. A 2025 short report

Salmonella Biofilms and Chlorine Dioxide: Serovar Variation, Mature-Biofilm Tolerance and the Risk of Under-Dosing

Salmonella biofilm varies by isolate, matures within days, and sub-lethal chlorine or peroxide has been shown to stimulate it. What is and is not known for

Multispecies Biofilms in Broiler and Pig Drinking-Water Systems: What a 2026 Field Study Found

2026 BMC Microbiology field study of biofilm in broiler and pig nursery drinking lines: 3.6 log CFU/cm², enterococci in 80% of samples, Pseudomonas and Sta

Research & updates

These supplementary research posts provide additional context; the evergreen guides above remain the primary reference.

Biofilm Formation and Control in Water Systems

Background reading from the existing ChloroKlean blog.

Spa and Hot Tub Hygiene Best Practices

Operational context for spa-pool hygiene.

Cooling Tower Water Treatment and Compliance

Cooling-system compliance and management context.