The Filtertherm® Process for DPF Cleaning

If the right equipment is essential, then the right process is CRITICAL. Follow our rigorous 8-Step DPF cleaning process for consistent results, every time. Let our experience work for you.

Why clean a DPF?

A DPF (diesel particulate filter)

is designed to catch & oxidize soot (unburned fuel/lube oil) and turn it into ash. The ash is pushed to the bottom of the filter and stored there. Over time it builds up and requires cleaning. With the cost of some new DPFs soaring to over $12,000, routine maintenance is key in all aspects of the DPF. Being proactive in your service intervals will decrease downtime, service expenses and increase proper system operation and profit. Thus, it’s important to regularly clean and maintain your filters, not only to preserve the functionality of the filter but to save on fuel and protect your engine.

Filtertherm® is establishing THE industry standard for DPF cleaning.

Here’s why.

Having the right equipment is only half the game.

The key is the process. Establishing and following the same process with every filter is the only way to ensure consistent results, every time. Without this consistency,  your results will vary from filter to filter. The Filtertherm® team has spent close to 15 years cleaning tens of thousands of filters. We’ve perfected our methods and share them with you.

Filtertherm® 8-Step DPF Cleaning Process

The Filtertherm® 8-Step DPF Cleaning Process delivers consistent, reliable results, every time! We offer in-depth training in best practices for emissions systems to shops just like yours. Our process is proudly backed by Redline Emissions Products® Tech Support. Combine the Filtertherm® process with our equipment to dramatically increase your ROI for DPF cleaning!

See for yourself. Check out our ROI calculator here.


inspection & documentation
We use Filtertrak™ DPF service tracking online application that stores pictures, vehicle information, filter information, cleaning records and more. This easy-to-use application stores before and after pictures, weights and allows you to email customers their info, look up old DPF service data and more.
Visually inspect the physical condition of the DPF, look for signs of damage to the substrate, cracks, is soot bypassing filter, hard ash centering, chemical / oil / wet / fuel / coolant soaked; cracked brick, cracked welds, dents in can, missing flanges.


We capture and record the weight of the DPF before and after cleaning, which helps determine how dirty or clogged the filter is when compared with the original DPF weight. Redline Emissions Products® DPFs come standard with a Born on Weight™ on the product label.
We use 030 stainless steel wire to drop into various cells (about 30 – 40 cells) of the DPF to determine what’s in the brick of the DPF before cleaning. This is our depth gauge that tells us how much of it is plugged. To wire test a silicon carbide, insert wire from the inlet side (dirty side) of filter. The wire should drop to the bottom for a clean DPF.


Get an initial flow reading of the DPF prior to cleaning to determine how plugged the DPF is. Use to compare against after the bake cycle to see the effectiveness of the initial bake / de-ash cycles.
Use the Filtertherm® Pulse Cleaner + the Dust Collector Kit or the FSX TrapBlaster™ 7 to de-ash / blow out DPFs. Blow out prior to de-ash & bake to remove soot that’s already loose; do an additional blow out / de-ash after bake to remove newly loosened sediment from the DPF.


We ALWAYS bake our DPFs as part of our cleaning process. Although DPFs are designed to be regen on the truck, perfect conditions don’t exist and baking ensures that compacted soot is loosened and able to be blown out of the unit effectively. The the Filtertherm® DPF oven was designed specifically to bake multiple DPFs.


Do an additional blow out / de-ash after bake to remove newly loosened sediment from the DPF. At any point in the inspection / cleaning process, re-bake the DPF if all of the soot was not converted to ash during the first baking cycle. This ensures the best results possible for your DPF cleaning.


Get an additional flow reading of the DPF after cleaning to determine how effective the previous cleaning cycles were. Repeat steps as necessary – bake > de-ash / blow > flow – until maximum amount of soot is turned to ash and removed from the DPF.


Re-weigh the DPF to compare to original weight to see how much soot and ash was successfully removed from the DPF. Redline Emissions Products® DPFs come standard with a Born on Weight™ on the product label.
Re-test the cells using the wire test to determine how effectively the soot and ash have been removed from the DPF. Again, to wire test a silicon carbide, insert wire from the inlet side (dirty side) of filter. The wire should drop to the bottom for a clean DPF.


inspection & documentation
Use Filtertrak™ DPF service tracking online application to log the before & after DPF images, the DOF weight info, any notes on the cleaning and all other information required by CARB or other regulatory agencies.
Conduct a final inspection of the DPF, noting all of the changes that occurred during the cleaning steps to give the customer a detailed, accurate report of the health of their DPF. Recommend replacing DPFs that were found to be damaged or not up to par.

Educate your customers

When you return the cleaned DPF and or re-install on customer vehicle, provide them the documentation they need to report on. OE service recommendations are between 200,000 – 300,000 miles, or 4500 hours – whichever comes first. Aftermarket manufacturers of DPFs recommend cleaning at 50,000 – 70,000 miles, or 1,000 hours – whichever comes first.

However, Filtertherm® recommends servicing your DPF at least once a year. Removing the soot more frequently will extend the life and performance of the DPF system and your engine. Hardened ash in the system restricts the flow and causes unnecessary engine failure issues. Proper DPF maintenance is key to a healthy truck.

These 8 Steps are a general guide for DPF cleaning. For in-depth training on best practices and emissions systems, contact our Redline Emissions Products® Tech Support.

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Simple, Reliable, and Effective.

FILTERtrak is the Diesel Markets Premier DPF Service Tracking Application

FILTERtrak™ stores pictures, vehicle information, filter information, cleaning records and more. FILTERtrak™ is now offered across the United States and Canada and is completely scalable.

FILTERtrak™ has an intuitive layout for easy training and implementation and makes it simple to view all your DPF service data and is easily accessible anywhere, anytime!  Check out our website for more info.