ChloroKlean Plus L20
A regenerative chlorine dioxide disinfectant solution with multi-sector BPR authorisation — delivering sustained antimicrobial activity, superior biofilm control, and proven Legionella prevention across water treatment, surface disinfection, and drinking water applications.
ChloroKlean Plus L20 is ChloroKlean's flagship chlorine dioxide disinfectant solution, designed for professional water treatment and disinfection applications across multiple sectors. Unlike single-use chlorine dioxide generators or unstable pre-mixed solutions, Plus L20 uses regenerative chemistry to deliver sustained, controlled release of chlorine dioxide at the point of use. It holds full GB BPR product authorisation across PT2 (pools, spas, and water systems), PT4 (food area disinfection), PT5 (drinking water), and PT11 (cooling and processing systems) — making it one of the most versatile chlorine dioxide products available in the UK market.
What Makes ChloroKlean Plus L20 Different
ChloroKlean Plus L20 is a regenerative liquid chlorine dioxide solution. The term 'regenerative' refers to the product's ability to maintain a sustained release of chlorine dioxide over time, rather than delivering a single high-concentration dose that rapidly depletes. This sustained release profile means that Plus L20 provides continuous antimicrobial activity in the water system, maintaining a stable residual that protects against recontamination between dosing events.
Many chlorine dioxide products on the market are either two-part systems that must be mixed on site (introducing operator error and safety risks) or pre-generated solutions that begin losing potency immediately after production. ChloroKlean Plus L20 is supplied as a ready-to-use liquid that activates upon dilution in the water system, providing a predictable and controllable chlorine dioxide residual without the complexity of on-site generation equipment.
The product is effective against a comprehensive spectrum of waterborne pathogens at concentrations below 0.5 ppm (parts per million). This includes Legionella pneumophila, Pseudomonas aeruginosa, E. coli, Listeria monocytogenes, Salmonella, and a wide range of other bacteria, viruses, fungi, and algae. At these low working concentrations, Plus L20 is safe for use in drinking water systems, swimming pools, and food contact applications — while still delivering the biofilm-penetrating action that sets chlorine dioxide apart from chlorine and bromine.
Multi-Sector BPR Authorisation: PT2, PT4, PT5, and PT11
One of ChloroKlean Plus L20's most significant advantages is its authorisation across four BPR product types, covering virtually every professional disinfection application. This multi-sector authorisation reflects the product's proven efficacy and safety across diverse use conditions — and provides duty holders with a single, fully compliant solution for complex facilities with multiple treatment requirements.
PT2 authorisation covers disinfection of water in private and public health areas — including swimming pools, spas, hot tubs, building hot and cold water systems, cooling towers, and HVAC systems. This is the most commonly required product type for Legionella control programmes, leisure water treatment, and environmental hygiene in commercial and institutional buildings.
PT4 authorisation covers food and feed area disinfection — surfaces, equipment, utensils, and pipework associated with food production, transport, storage, and consumption. Plus L20 is approved for food-contact surface disinfection in commercial kitchens, food processing plants, breweries, dairies, and catering environments. The absence of halogenated organic residues makes it particularly suitable for applications where chemical tainting is a concern.
PT5 authorisation covers drinking water disinfection — the most stringently assessed product type in the BPR framework. Plus L20 is approved for treatment of potable water supplies, providing effective disinfection while maintaining compliance with Drinking Water Inspectorate (DWI) standards for chlorite and chlorate by-products.
PT11 authorisation covers preservatives for liquid cooling and processing systems — including closed-loop cooling circuits, industrial process water, and manufacturing systems where microbial contamination can compromise product quality or system integrity.
How ChloroKlean Plus L20 Controls Biofilm
Biofilm control is the defining capability that separates chlorine dioxide from other disinfectants, and ChloroKlean Plus L20 delivers this capability with particular effectiveness due to its sustained release profile. While a single high-dose treatment may temporarily disrupt biofilm, sustained low-level exposure is what prevents re-establishment and progressively cleans pipework over time.
Plus L20's regenerative chemistry maintains a continuous chlorine dioxide presence in the water system. This sustained residual penetrates the extracellular polymeric substance (EPS) matrix that protects bacteria within biofilm, reaching and killing organisms that surface-acting disinfectants like chlorine and bromine cannot reach. The selective oxidation mechanism of chlorine dioxide means it is not consumed by reaction with the organic components of the EPS — it passes through to attack the viable cells within.
In practical terms, water systems treated with ChloroKlean Plus L20 show progressive improvement in microbiological results over the first weeks and months of treatment. As existing biofilm is removed and prevented from re-forming, the total microbial burden in the system decreases, disinfectant demand reduces, and residual stability improves. Operators typically report cleaner pipework, longer filter runs, and more consistent compliance with microbiological standards.
For systems with established biofilm problems — evidenced by persistent Legionella or Pseudomonas detections despite adequate bulk water disinfection — ChloroKlean Plus L20 can be used at elevated concentrations for an initial biofilm removal treatment before transitioning to routine low-level dosing. This two-phase approach provides rapid remediation followed by sustained protection.
Applications Across Key Sectors
Healthcare facilities — hospitals, care homes, dental surgeries, and GP practices — use ChloroKlean Plus L20 for Legionella control in hot and cold water systems under ACOP L8 and HSG274 Part 2. The product's biofilm-penetrating capability is critical in healthcare environments where immunocompromised patients face elevated risk from waterborne pathogens. Plus L20 maintains water system hygiene without the corrosive effects and by-products associated with high-dose chlorine treatment.
Hospitality and leisure — hotels, holiday parks, leisure centres, and spa resorts — rely on Plus L20 for pool, spa, and hot tub disinfection (PT2) as well as building water system treatment. The absence of chloramines means better air quality in indoor pool environments, no chemical smell in hotel bathrooms, and improved guest comfort. Many operators use Plus L20 across their entire water infrastructure, from the pool to the kitchen to the drinking water supply.
Food and beverage processing — breweries, dairies, bakeries, meat processing, and fresh produce operations — use Plus L20 for CIP (clean-in-place) disinfection, process water treatment, and surface hygiene. The PT4 and PT5 authorisations allow a single product to address both surface and water treatment requirements, and the absence of halogenated organic residues eliminates tainting risk.
Industrial and commercial buildings — offices, shopping centres, universities, and manufacturing facilities — use Plus L20 for cooling tower treatment (PT2/PT11) and building water system hygiene. The product's effectiveness at low concentrations and its compatibility with common pipework materials (copper, stainless steel, CPVC, PEX) make it suitable for a wide range of building water system configurations.
Dosing, Monitoring, and Technical Support
ChloroKlean Plus L20 can be dosed manually or via automatic dosing systems depending on the application and scale of the installation. For larger systems and commercial applications, automatic dosing with real-time residual monitoring is recommended to ensure consistent ClO₂ levels and reduce operator workload. ChloroKlean can advise on appropriate dosing equipment specification and configuration.
Target residual concentrations vary by application: typical ranges are 0.1–0.5 mg/L for routine water system maintenance, 0.3–0.5 mg/L for Legionella control programmes, 0.1–0.3 mg/L for swimming pool and spa treatment, and up to 5 mg/L for short-duration biofilm removal treatments. ChloroKlean's technical team provides site-specific dosing recommendations based on system volume, flow rates, temperature, organic demand, and the target organisms of concern.
Monitoring is straightforward using standard chlorine dioxide test kits (colorimetric DPD method) or inline residual sensors for automated systems. Plus L20 residuals do not interfere with standard water quality tests for pH, alkalinity, or other parameters. Chlorite and chlorate by-products should be monitored in drinking water applications to ensure compliance with DWI standards.
Every order of ChloroKlean Plus L20 is supplied with complete regulatory documentation including the GB BPR product authorisation number, current Safety Data Sheet (SDS), Technical Data Sheet (TDS), and application-specific guidance notes. Our technical team is available for site assessments, dosing calculations, troubleshooting, and ongoing support throughout the product lifecycle.
Product Specifications and Supply
ChloroKlean Plus L20 is supplied as a liquid concentrate in a range of pack sizes suitable for applications from small building water systems to large industrial installations. The product has a defined shelf life when stored in accordance with SDS recommendations — in a cool, dry, well-ventilated area away from direct sunlight and incompatible materials.
The product is manufactured to consistent quality standards with batch-level traceability. Every batch is tested for active concentration, purity, and stability before release. Certificates of analysis are available on request for applications requiring documented batch verification — including pharmaceutical, healthcare, and food manufacturing environments.
ChloroKlean supplies Plus L20 directly to end users and through approved water treatment contractors across the UK. We offer scheduled delivery, emergency supply for reactive situations, and technical support as part of our standard service. Volume pricing is available for larger installations and long-term supply agreements.
For organisations evaluating chlorine dioxide for the first time, ChloroKlean offers trial quantities of Plus L20 with full technical support to demonstrate performance in your specific application before committing to a full-scale transition. Contact our technical team to discuss trial arrangements.
Key Data & Statistics
4
BPR Product Type authorisations (PT2, PT4, PT5, PT11)
<0.5 ppm
Effective residual concentration for Legionella control
pH 4–10
Full disinfection efficacy range
7
Available pack sizes from 500ml to 1000L IBC
ChloroKlean Plus L20 vs Alternative Disinfectants
How ChloroKlean Plus L20's regenerative chlorine dioxide compares to conventional disinfection chemicals.
| Feature | ChloroKlean Plus L20 (ClO₂) | Sodium Hypochlorite | Bromine (BCDMH) | Peracetic Acid |
|---|---|---|---|---|
| Active Substance | Regenerative chlorine dioxide | Free available chlorine | Hypobromous acid | Peracetic acid + H₂O₂ |
| BPR Authorisations | PT2, PT4, PT5, PT11 | Typically PT2 or PT5 only | Varies by product | Typically PT4 only |
| Biofilm Control | Penetrates and removes biofilm | Surface action only | No biofilm penetration | Moderate biofilm activity |
| Residual Persistence | Sustained release — long-lasting | Rapidly consumed by organic demand | Depletes quickly at high temperatures | Short-lived residual |
| Disinfection By-Products | Chlorite only (manageable) | THMs, chloramines, HAAs | Brominated THMs, bromate | Acetic acid (benign) |
| pH Independence | Effective pH 4–10 | Effective pH 7.2–7.6 | Effective pH 7.0–7.6 | Effective in acidic range |
| Legionella Efficacy | Proven at <0.5 ppm residual | Higher doses needed | Limited at elevated temperatures | Effective but corrosive |
| Multi-Sector Versatility | Pools, food, drinking water, cooling | Limited cross-sector use | Mainly pools and spas | Mainly food processing |
Plus L20 is a regenerative liquid chlorine dioxide — it continuously generates ClO₂ in solution, providing sustained antimicrobial activity.
How to Get Started with ChloroKlean Plus L20
A step-by-step guide to evaluating and implementing ChloroKlean Plus L20 in your water treatment or disinfection programme.
Identify Your Disinfection Requirements
Document your water treatment and disinfection needs across your facility. Identify which applications require PT2, PT4, PT5, or PT11 authorisation. Note current disinfectant products, dosing methods, and any performance challenges including biofilm issues, Legionella or Pseudomonas detections, chloramine complaints, or regulatory non-compliance.
Request a Free Technical Assessment
Contact ChloroKlean on +44 333 772 7379 or email hello@chloroklean.com with details of your installation. Our technical team will assess your system, review your current treatment programme, and recommend the appropriate Plus L20 dosing strategy and equipment specification for your specific application.
Review Product Documentation
Request the complete Plus L20 documentation package including the GB BPR product authorisation number for each relevant product type, current Safety Data Sheet, Technical Data Sheet, and application-specific guidance. Review the documentation against your COSHH assessment and written scheme of control requirements.
Conduct a Trial
ChloroKlean can supply trial quantities of Plus L20 for evaluation in a representative section of your water system. Monitor ClO₂ residuals, microbiological results, and biofilm indicators during the trial period. Compare performance against your current disinfectant to quantify the improvement in water quality and operational efficiency.
Implement Full-Scale Treatment
Based on trial results, transition your full system to ChloroKlean Plus L20. Update your written scheme of control, COSHH assessments, monitoring procedures, and product inventory. ChloroKlean provides ongoing technical support, scheduled supply, and access to our team for any questions or challenges that arise during operation.
Expert Insights
"We developed Plus L20 to solve the problems that water treatment professionals face every day — inconsistent residuals, persistent biofilm, reactive Legionella results, and the complexity of managing multiple products across different applications. One product, four BPR authorisations, sustained release chemistry, and proven biofilm control. That is what Plus L20 delivers."
Gavin Owen
Managing Director, ChloroKlean
"The regenerative chemistry is what sets Plus L20 apart from other chlorine dioxide products on the market. Pre-mixed solutions lose potency from the moment they are generated. Two-part systems depend on accurate on-site mixing. Plus L20 activates on contact with the water system and maintains a sustained ClO₂ residual — giving operators consistent, reliable disinfection without the variability and risk of other approaches."
Gavin Owen
Managing Director, ChloroKlean
"When we supply Plus L20, we supply a complete solution — the product, the documentation, the dosing guidance, and the technical support. Every duty holder gets a BPR authorisation number they can verify, an SDS they can build their COSHH assessment from, and a technical team they can call when they need advice. That is the standard of service that professional water treatment demands."
Gavin Owen
Managing Director, ChloroKlean
About the Reviewer
Gavin Owen
Managing Director, ChloroKlean
Gavin Owen leads ChloroKlean's technical and commercial operations, bringing over 20 years of experience in industrial chemical distribution and water treatment. He oversees product development, regulatory compliance strategy, and the company's BPR authorisation programme across PT2, PT4, PT5, and PT11 product types. Gavin works directly with water treatment professionals, facilities managers, and public health engineers across healthcare, leisure, food processing, and industrial sectors.
Related Products
BPR-authorised chlorine dioxide products available from ChloroKlean.
ChloroKlean Plus L20
Regenerative liquid chlorine dioxide with sustained antimicrobial activity. Effective against Legionella, Pseudomonas, E. coli, and biofilm at less than 0.5 ppm. BPR authorised across PT2, PT4, PT5, and PT11.
ChloroKlean Spa 500
Chlorine dioxide solution specifically formulated for swimming pools and spas. BPR PT2 authorised — the companion product to Plus L20 for leisure water applications.
ChloroKlean Surface Disinfectant
Food-safe surface disinfection for food processing, catering, healthcare, and wet leisure environments. BPR PT4 authorised — complementing Plus L20's water treatment capability.
Frequently Asked Questions
Common questions about this topic, answered by our technical team.
Important Safety Information
- ChloroKlean Plus L20 must be stored, handled, and used in accordance with the current Safety Data Sheet and product label directions.
- Appropriate personal protective equipment (PPE) must be worn when handling concentrated Plus L20, including chemical-resistant gloves, safety goggles, and suitable protective clothing as specified in the SDS.
- Do not mix ChloroKlean Plus L20 with chlorine, bromine, acids, or any other chemicals unless specified in the product documentation. Mixing incompatible chemicals can release hazardous gases.
- A COSHH assessment must be completed before using Plus L20 in any application. The assessment should consider exposure routes, concentration, frequency of use, and risk mitigation measures.
- In drinking water applications (PT5), monitor chlorite and chlorate by-product levels to ensure compliance with DWI regulatory limits.
- Keep out of reach of children. Store in original containers in a cool, dry, well-ventilated area away from direct sunlight and incompatible materials.
This information is provided for guidance only and does not replace the product Safety Data Sheet or COSHH assessment. Always refer to the current SDS and seek professional advice where required. ChloroKlean Plus L20 is a biocidal product — use biocides safely and always read the label and product information before use.
Related Resources
Continue exploring our knowledge base and product information.
BPR Compliant Disinfectant Guide
Complete guide to the UK Biocidal Products Regulation — understand the PT2, PT4, PT5, and PT11 authorisations that Plus L20 holds.
PT2 Disinfectant Explained
Understand Product Type 2 authorisation and why it matters for pools, spas, water systems, and cooling towers.
Chlorine Dioxide vs Chlorine
Why chlorine dioxide outperforms traditional chlorine for water disinfection — the science behind Plus L20's advantages.
Chlorine Dioxide vs Bromine
How Plus L20's chlorine dioxide compares with bromine across efficacy, safety, and cost for pools, spas, and cooling towers.
Spa Water Disinfection Guide
How Plus L20 and ChloroKlean Spa 500 deliver HSG282-compliant spa water disinfection with biofilm control.
Chlorine Dioxide for Hot Tubs
Complete guide to using Plus L20 with automatic dosing for commercial hot tub disinfection.
Chlorine Dioxide for Swimming Pools
How Plus L20 eliminates chloramines and delivers superior pool water quality as a chlorine alternative.
Chlorine Dioxide UK Supplier
Why ChloroKlean is a trusted UK supplier — product range, regulatory compliance, and technical support.
Legionella Control Solutions
How Plus L20 supports Legionella risk management programmes under ACOP L8 and HSG274.
View Our Full Product Range
Explore ChloroKlean's complete range of BPR-authorised chlorine dioxide products.
Contact Us
Request a free technical assessment, trial supply, or product documentation from our team.
Sources & References
This article references guidance from the following authoritative sources:
- Biocidal Products Regulation (BPR, Regulation (EU) 528/2012)
ECHA — European Chemicals Agency
- GB Biocidal Products Register
HSE — Health and Safety Executive
- ACOP L8: Legionnaires' disease - Control of legionella bacteria in water systems
HSE — Health and Safety Executive
- HSG274 Part 2: The control of legionella bacteria in hot and cold water systems
HSE — Health and Safety Executive
- HSG282: The control of legionella and other infectious agents in spa-pool systems
HSE — Health and Safety Executive
- Guidelines for Drinking-water Quality - Chlorine Dioxide and Chlorite
WHO — World Health Organization
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