Diesel Particulate Filters (DPFs) are used to trap noxious particulate matter (soot and ash) in the exhaust system of a diesel engine. Whilst soot deposits are generally automatically removed  during engine operation by a high-temperature process called ‘regeneration’, ash accumulates in the DPF and needs to be removed by a specialist process, to avoid the unit becoming clogged and impacting on engine performance.

Ceramex has over 20 years of DPF cleaning and refurbishing experience and we have cleaned over 150,000 filters during this time. We have developed a patented cleaning technology known as Xpurge which provides world-class cleaning performance. Ceramex also has a unique DPF inspection system called Veritex that allows us to examine the DPF to ensure that cleaning has been completed successfully.

So why choose Ceramex?

  • Superior performance over conventional cleaning processes
  • Patented, automated technology
  • High capacity, fast turnaround
  • Longer interval between cleans
  • Up to 7% improvement in fuel consumption
  • Less filter failures and expensive replacements
  • Full inspection report
  • Patented inspection process for audits and monitoring
  • Full service history of the filter during its operational life

Xpurge® Cleaning Technology

Trusted by the world’s leading vehicle and equipment manufacturers, Xpurge is the next generation of DPF cleaning technology that provides outstanding cleaning performance that restores filters to a condition that is as good as new. Xpurge cleaning is highly effective and can remove 30% more contaminants than conventional methods, in a fraction of the time.

The patented technology uses an innovative combination of purified water and air in order to remove any accumulated soot and ash deposits from the filter in an automated process that provides rapid processing and excellent first pass cleaning results. Ceramex has also developed proprietary technologies for drying DPFs after cleaning.

Veritex® Inspection Technology

Our unique Veritex inspection technology is our most comprehensive test method. Veritex inspection technology uses light transmission to verify a DPF’s internal condition after cleaning. This patented method provides a picture of the internal filter condition, identifying any damage or blockages.

In addition, Veritex provides evidence that the filter has been cleaned properly and will continue to perform effectively. The system generates a record of a filter’s condition every time it is cleaned, allowing individual filters to be monitored throughout their service life.

Vericat™ Catalyst Performance Testing

Vericat is an offline performance test offered by Ceramex to determine catalyst efficiency for DPFs and DOCs. Vericat highlights any in-service degradation that may have occurred within a filter.

Veritrap™ Substrate Integrity Test

Veritrap is a DPF substrate integrity and filtration test for DPFs. Veritrap uses a stream of benign particles to determine the integrity of the ceramic substrate within the DPF.


What is a DPF?
Diesel Particulate Filters (DPFs) remove particulate matter, such as soot and ash, from diesel engine exhausts. Due to stringent international emissions regulations, DPFs are being fitted to more and more trucks, buses, and cars. DPFs consist of numerous small channels in a porous ceramic honeycomb material, designed to trap particulate matter.

When the exhaust gas passes through the filter’s inlet channels, it’s forced through porous walls of the filter, before emerging from the outlet channels. The particulate matter is then trapped when the exhaust passes through these channel walls, removing up to 99% of the particulate matter in the exhaust fumes.

Which vehicles require a DPF?
DPFs have been used in cars, trucks, buses and off-highway plant and machinery for several years. The earliest DPFs appeared in cars as long ago as 2001 and all new diesel cars are now fitted with a DPF, in accordance with EU Euro VI emissions regulations.

Why do DPFs need cleaning?
Particulate Matter (soot and ash) steadily builds up in the DPF during use. The soot is usually removed during engine operation (by an automatic process known as regeneration) but the ash accumulates in the filter and needs to be removed periodically by cleaning the DPF to prevent blockages.

How frequently should they be cleaned?
The frequency of DPF cleaning varies enormously with the typical duties performed by a vehicle. The vehicle manufacturer will provide guidance on the recommended cleaning frequency and these can typically vary between 1-2 years, depending on the usage of the vehicle. However, DPFs fitted to vehicles that make frequent short trips at low speeds can often become clogged much sooner.

Many vehicles are fitted with a warning light that informs the driver when the DPF needs cleaning, based on an increase in the exhaust back pressure detected by the engine.

How long does a DPF last?
Under normal operating conditions, a DPF should last as long as a vehicle, although it will require servicing at regular intervals (depending on the duty-cycle of the vehicle).

How does Ceramex cleaning technology work?
Our patented Xpurge® DPF cleaning process uses an innovative combination of purified water and air in order to remove any accumulated soot and ash deposits from the filter. Ceramex has also developed proprietary technologies for drying the DPFs after cleaning. We are then able to inspect the condition of each individual DPF using our patented Veritex® DPF inspection technology and other techniques

What is the cost of cleaning a commercial DPF?
The cleaning cost varies according to the number of filters that are cleaned under any individual contract. For a detailed quotation, please contact us at enquiries@ceramex.com

How can we be sure we’d receive our DPF back?
Each filter is uniquely barcoded, allowing it to be tracked throughout the entire process right through to dispatch, so customers know they are receiving their original DPF back.

What type of DPFs can you clean?
Ceramex can clean all different types of DPFs used in buses, trucks and other heavy-duty vehicles and engines. DPFs come in many different sizes, as well as a variety of ceramic materials, including Silicon Carbide, Cordierite and Aluminium Titanate.