ChloroKlean Knowledge Centre

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 are suspended in liquid; biofilm-associated cells are attached to a surface and embedded in matrix. The distinction matters when interp

Extracellular polymeric substances (EPS) are matrix materials associated with biofilm communities. They can include polysaccharides, proteins, nucleic acid

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

A measured disinfectant residual can be a useful operational indicator, but it is not a direct measurement of biofilm or a guarantee of control.

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

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

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

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

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

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

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

Verifying that biofilm is under control means combining lines of evidence, because no single test sees the whole system. This cornerstone guide sets out wh

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

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 waterlines are narrow, warm, intermittently used polymer tubes carrying low-flow water, which makes them one of the most biofilm-prone water sy

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

A BPR-compliant disinfectant is GB BPR compliant for its intended use. How to verify PT2, PT4, PT5, or PT11 compliance in the UK.

PT2 disinfectants are BPR-compliant biocides for pools, spas, healthcare, and public buildings. How to choose compliant PT2 products in the UK.

Chlorine dioxide is usually made where it is used, so three separate regulatory questions apply: is the active substance approved or under review, is its s

Three different numbers are often run together: the WHO provisional guideline values of 0.7 mg/L for chlorite and for chlorate, the UK condition that chlor

GB BPR efficacy claims explained: HSE evidence requirements for disinfectant claims, the mandatory 'Use biocides safely' wording, prohibited terms such as

Chlorine dioxide achieves 4-log Legionella reduction at <0.5 ppm and penetrates biofilm thermal treatment cannot reach. ACOP L8 compliant. ChloroKlean.

Chlorine dioxide controls Legionella and removes biofilm from cooling tower fill packs with minimal gassing off. HSG274 Part 1 compliant. ChloroKlean.

How to meet ACOP L8 and HSG274 obligations for Legionella control using regenerative chlorine dioxide. Duty holder responsibilities, written scheme, monitoring.

CT, concentration multiplied by contact time, is the standard shorthand for disinfectant exposure. It is useful, but the inactivation rate it predicts diff

Why turbidity, iron, manganese, hydrogen sulphide, organic matter and ammonia consume disinfectant in private water supplies, the DWI pretreatment options,

ChloroKlean is a UK chlorine dioxide supplier with BPR compliance across PT2, PT4, PT5, and PT11. 500ml to 1000L IBC packs with 48-hour UK delivery.

ChloroKlean Plus L20 is a regenerative chlorine dioxide with BPR compliance across PT2, PT4, PT5, PT11. Sustained ClO₂ for biofilm and Legionella control.

PT4 chlorine dioxide for food areas: no THMs or chloramines, low surface residue, chlorite/chlorate managed by dosing. Effective against Listeria, Salmonella, E. coli.

How regenerative chlorine dioxide works in ChloroKlean Plus L20 - the science of in-situ activation, sustained residual, and biofilm penetration in water systems.

Practical dose rates, contact times, and monitoring guidance for ChloroKlean Plus L20 across pools and spas, cooling towers, potable water, and food contact surfaces.

Chlorine dioxide achieves 99.9% Legionella kill rate at <0.5 ppm in spas with zero chloramines or THMs. ClO₂ vs bromine and chlorine compared.

Chlorine dioxide avoids pool chloramines and acts on pipework biofilm. Why commercial pools switch to ClO₂, and where UV is still needed for Cryptosporidium.

Chlorine dioxide maintains full efficacy at 37–40°C where bromine and chlorine degrade. ClO₂ removes jet biofilm and prevents Legionella in hot tubs.

Chlorine dioxide penetrates biofilm and produces zero brominated by-products; bromine cannot. ClO₂ vs bromine compared for efficacy, safety, and BPR status.

Chlorine dioxide produces zero THMs, zero chloramines, and works at pH 4–10. Chlorine does not. Side-by-side ClO₂ vs chlorine comparison.

Side-by-side comparison of chlorine dioxide and sodium hypochlorite for cooling tower Legionella and biofilm control - HSG274-aligned, with dose and corrosion data.