ChloroKlean BPR Compliant Chlorine Dioxide Disinfectant - UK Supplier

    Chlorine Dioxide vs UV for Food and Beverage CIP

    UV (ultraviolet) disinfection inactivates microorganisms by damaging their DNA at the point the water passes through the UV chamber. It produces no disinfection by-products and is highly effective on clear, low-turbidity water for pathogens including Cryptosporidium. However, UV has three structural limitations for food and beverage CIP (Clean-in-Place): it provides no residual downstream of the chamber, it only treats water passing directly through the lamp (the 'shadow effect' means no protection on equipment surfaces or in dead legs), and it does not penetrate or remove existing biofilm inside pipework and tanks. Chlorine dioxide (ClO₂) is a chemical biocide that maintains a measurable residual throughout the CIP loop, penetrates biofilm in pipework, and acts on equipment surfaces during cleaning cycles. ClO₂ at 0.1-0.5 ppm is BPR-compliant for PT4 (food and feed area) applications under the UK GB BPR. The two technologies are often complementary: UV for incoming process water, ClO₂ for CIP loops and surface sanitisation.

    Author
    Key Advantage of ClO₂
    Provides measurable residual throughout CIP loops, penetrates biofilm in pipework, and acts on equipment surfaces - UV does none of these.
    By-products
    ClO₂ produces no THMs or HAAs at typical dose rates. UV produces no chemical by-products but can generate small amounts of nitrite from nitrate in some source waters.
    pH Range
    ClO₂ effective at pH 4-10. UV unaffected by pH but blocked by turbidity, suspended solids, and biofilm shadowing.
    Regulatory Sources
    EHEDG Guidelines, BRCGS Food Safety Standard, WHO Drinking-water Guidelines, EU BPR 528/2012 PT4, FSA UK guidance, FDA 21 CFR 178.1010
    UK Compliance
    ChloroKlean Plus L20 is BPR-compliant for PT4 (food and feed area hygiene) applications under UK GB BPR. UV systems must comply with relevant water treatment standards.
    Comparison Guide

    Chlorine Dioxide vs UV

    UV is excellent point-of-use disinfection for clear water - but it cannot reach equipment surfaces, leaves no residual, and cannot break down biofilm inside CIP loops. Compare ClO₂ and UV for food and beverage hygiene.

    ClO₂

    Chlorine Dioxide

    • Sustained residual through entire CIP loop
    • Removes existing biofilm in pipework
    • Works on equipment surfaces, valves, and dead legs
    • BPR-compliant PT4 for food and feed areas
    • No shadow effect - reaches everywhere water flows
    UV

    UV (Ultraviolet)

    • No chemical residual or by-products at point of use
    • Effective against Cryptosporidium and most pathogens
    • No residual protection downstream of lamp
    • Cannot penetrate or remove biofilm on equipment
    • Effectiveness drops with turbidity and lamp fouling

    Detailed Comparison

    Detailed comparison of chlorine dioxide versus uv
    FeatureChlorine DioxideUV
    Residual Disinfection

    Yes

    Maintains 0.1-0.5 ppm through CIP loop

    No

    Effective only inside the UV chamber

    Biofilm Removal

    Excellent

    Penetrates and breaks down EPS matrix

    None

    Cannot reach biofilm inside pipework

    Surface Sanitisation

    Yes

    Contact with tank walls, valves, gaskets

    No

    Only treats water passing through lamp

    Dead Leg Treatment

    Yes

    Residual reaches stagnant zones

    No

    No flow through lamp = no protection

    Effect of Turbidity

    Minimal

    Works in coloured and turbid product water

    Severe

    Suspended solids block UV transmission

    Capital Cost

    Low

    Metering pump + storage tank

    Moderate

    UV chamber + ballast + monitoring

    Operating Cost

    Low chemical use

    Sub-ppm dosing rates

    Lamp replacement

    Annual lamp + quartz sleeve cleaning

    Cryptosporidium Efficacy

    Limited

    Only at high CT; not accepted by DWI as a barrier in private supplies

    Excellent

    Low UV dose inactivates oocysts

    BPR Status

    PT4 Compliant

    Authorised for food and feed area hygiene

    Out of BPR scope

    Physical process, not a biocidal product

    When to Choose Each

    Choose Chlorine Dioxide When:

    • You need to break down existing biofilm in CIP loops
    • Equipment surfaces, valves, or dead legs need sanitisation
    • A measurable residual is required for HACCP / BRCGS compliance
    • Process water has variable turbidity or organic content
    • Food or feed area hygiene under BPR PT4 is required
    • Replacing peracetic acid or sodium hypochlorite without raising corrosion

    Consider UV When:

    • Final polishing of clear, pre-filtered bottled water
    • Point-of-use disinfection where no residual is wanted in product
    • Cryptosporidium-specific risk in incoming municipal supply
    • Low-flow inline disinfection of process water with no biofilm history
    • Used in series with a chemical biocide for surfaces
    "UV is brilliant at what it does - which is killing planktonic organisms in clear water as they pass through the lamp. The problem in food and beverage CIP is that pathogens are rarely planktonic; they're sitting in biofilm on the inside of a heat exchanger, a valve seat, or a dead leg in a CIP return line. UV cannot get there. Chlorine dioxide can. We routinely see plants pair UV for incoming water with ChloroKlean for the CIP loop itself, and the microbiology results speak for themselves."
    GO

    Gavin Owen, Managing Director, ChloroKlean

    BPR-compliant disinfection specialist

    Why Choose ChloroKlean Plus L20

    If you're considering switching to chlorine dioxide, ChloroKlean Plus L20 is purpose-built for industrial and commercial applications.

    BPR PT4 Compliant

    Authorised under UK GB BPR for food and feed area hygiene. Approved for use on surfaces in contact with food and beverage at specified residual concentrations.

    Penetrates CIP Biofilm

    Regenerative ClO₂ chemistry penetrates extracellular polymeric substance (EPS) matrix in CIP loops, where UV cannot reach. Documented in poultry and vegetable processing case studies.

    Reduces Chemical Load

    Field-proven 99% chemical reduction in poultry processing versus sodium hypochlorite. Lower dose rates than PAA, no corrosion of stainless steel CIP equipment.

    Regulatory and Scientific References

    This comparison is informed by the following authoritative sources. Always refer to the latest published guidance.

    EHEDG Guidelines
    European Hygienic Engineering and Design Group

    Hygienic Equipment Design and CIP

    EHEDG sets the European standard for hygienic design of food processing equipment, including CIP system design and biocide selection.

    View source
    BRCGS Food Safety
    Brand Reputation through Compliance Global Standards

    Global Standard Food Safety Issue 9

    BRCGS requires documented cleaning and disinfection procedures, including microbiological verification - both UV and ClO₂ can support compliance when used appropriately.

    View source
    WHO Guidelines
    World Health Organization (WHO)

    Guidelines for Drinking-water Quality (UV Disinfection)

    WHO guidance on UV disinfection acknowledges its lack of residual effect and recommends a downstream chemical residual for distributed systems.

    View source
    FDA 21 CFR 178.1010
    US Food and Drug Administration

    Sanitizing Solutions

    FDA permits chlorine dioxide as a no-rinse sanitiser on food-contact surfaces at up to 200 ppm under specified conditions.

    View source
    EU BPR PT4
    European Chemicals Agency (ECHA)

    Biocidal Products Regulation - Product Type 4 (Food and Feed)

    PT4 covers biocides used in food and feed areas including dairy processing, beverage production, and CIP systems. Chlorine dioxide is an approved active substance.

    View source

    Frequently Asked Questions

    Not on its own. UV inactivates pathogens only inside the UV chamber, with no residual downstream and no contact with equipment surfaces. CIP loops accumulate biofilm on tank walls, valves, gaskets, and dead legs where UV light cannot reach. A chemical biocide such as chlorine dioxide is required to clean and sanitise those surfaces and to maintain residual protection during and after the cleaning cycle.

    No. UV is a line-of-sight technology and cannot penetrate the extracellular polymeric substance (EPS) matrix that protects biofilm. Pipe walls, biofilm layers, and even mild turbidity all block UV transmission. Chlorine dioxide diffuses into biofilm and oxidises the EPS matrix, which is why it is widely specified for biofilm removal in CIP loops.

    Yes, when used at authorised residual concentrations. Under UK GB BPR PT4 and FDA 21 CFR 178.1010, chlorine dioxide is permitted as a sanitiser on food-contact surfaces. ChloroKlean Plus L20 is BPR-compliant for PT4 food and feed area hygiene.

    Yes, and this is often the strongest combination. UV is used on incoming process water (for example, post-RO bottling water) to inactivate planktonic pathogens before filling, while chlorine dioxide is dosed into CIP and process loops for residual protection and biofilm removal. The two technologies do not interfere and address complementary risks. Contact ChloroKlean's technical team for a combined specification.

    UV is the reliable option. Low UV doses (around 12 mJ/cm²) inactivate Cryptosporidium oocysts very efficiently, which is why UV is widely used in municipal drinking water. Chlorine dioxide can inactivate Cryptosporidium only at high CT values, and DWI does not accept it as a Cryptosporidium barrier in private water supplies. For incoming clear water, UV is more economical; for distribution and CIP residual, ClO₂ is the practical choice.

    Three reasons: turbidity in product water blocks UV transmission, organic colour absorbs UV light, and fouling on the quartz sleeve reduces effective dose. Many food and beverage process streams have colour or solids that make UV impractical without significant pre-treatment. Chlorine dioxide is not blocked by turbidity or colour - see our vegetable processing case study.

    Add Residual Protection to Your CIP Loops

    ChloroKlean Plus L20 delivers BPR PT4-compliant chlorine dioxide for CIP and process water disinfection. Works where UV cannot reach.