Effective & sustainable wastewater treatment
Comprex® efficiently removes deposits in pipes throughout the entire wastewater treatment process.
Typical challenges - and how we solve them
Wastewater treatment plants require properly functioning pipelines. After all, these are the connecting lifelines between the various treatment steps in the process for treating wastewater and the sludge produced in the process. comprex enables simple and risk-free maintenance.
The problem
Every major wastewater treatment plant has hundreds of meters of piping to transport water and sludge through the various treatment stages. All wastewater treatment processes produce large quantities of sewage sludge.
In the primary sludge pipes, but also in excess sludge pipes, grease pipes, thick sludge pipes and centrate pipes, very sticky deposits form again and again during operation.
These narrow the cross-section and minimize the delivery capacity of the pumps. The result: complete clogging of the line and failure of units or cleaning stages.
The solution:
Pipes in sewage treatment plants can usually be cleaned with comprex without any problems. The necessary connections are usually already in place and impulses of air and water (service water) can be used to effectively remove deposits.
For particularly stubborn deposits or hard, crystalline consistency, adding rock salt to your pulse flush is another way to restore your plumbing.
Typical areas of application in wastewater treatment:
- Sludge lines
- Central water pipes
- Service water systems
- Digester gas lines
The result
comprex helps to avoid complete pipe blockages, damage or interruptions to operation. Early action enables a problem-free cleaning process and optimum cleaning results.
Your systems and pipes are clean again, operation runs smoothly and maintenance costs are significantly reduced.
With comprex, we contribute to condition-based maintenance. We help maintain or restore operational safety for your wastewater treatment process.
How comprex sustainably improves the performance of your wastewater treatment system
comprex dissolves deposits in the pipes of your wastewater treatment plants quickly and easily. Our technology maintains or restores performance – without the risk of solid displacers getting stuck, as is the case when using pigs, for example.
- HYGIENIC CONDITIONS
- IMPROVED HYDRAULICS
- SUSTAINABLE GRID OPERATION
- INCREASED OPERATIONAL SAFETY
- INCREASED PERFORMANCE
- ENERGY-EFFICIENT OPERATION

Limescale deposits from a drinking water pipe in the distribution network

Iron sludge from a well water pipe

Manganese deposits from a drinking water network

Before and after cleaning: Semi-solid iron sludge in a raw water pipe

Iron incrustations from a drinking water pipe

Turbidity monitoring: water samples during Comprex® cleaning

Sludge discharge from a raw water pipe
Benefit from the Comprex® advantages now!
Whether drinking water and waste water in municipalities, industrial piping systems or water pipes in buildings – each area has its own requirements. We work with you to develop a tailor-made cleaning solution that works, saves resources and delivers lasting results.
Fast, thorough, resource-saving - without chemicals
Up to 80% shorter
Up to 100x stronger
Up to 90% less
Up to 10x faster
Three steps to a clean line
Step 1 Analysis & planning
We work with you to plan the optimum cleaning operation – individually tailored to your business, the condition of the pipes and your objectives.
Pipes in sewage treatment plants can usually be cleaned quickly and easily with comprex. Storz-C flush connections are usually already in place at the required locations or nearby.
Step 2 Preparation
We plan the cleaning sections together with you, determine the entry and exit points and take care of all the logistics. Our team of technicians will come to you with the right equipment and stay on site for the duration of the project.
Details on our mobile cleaning systems and self-sufficient trailers for different nominal widths can be found here. We are also happy to implement permanently integrated solutions with you.
Step 3 Cleaning & commissioning
In addition to our comprex air, only your process water is used as a working medium. The water can easily be fed into sumps, basins or containers. As a rule, cleaning does not require any conversions or decommissioning. The pumping times and feed rates of the various clarification processes are taken into account. Cleaning is carried out using pulses of compressed air and water(Comprex®) introduced into the section to be cleaned.
Deposits are reliably removed – without chemicals and with minimal water consumption. Once the cleaning measures have been completed, we return the system to normal operation ready for use.
Fast, professional and ready for use: you book our service and our experienced team of technicians will come to you with the necessary equipment and carry out the cleaning for you – whether as a one-off or regularly as part of your maintenance concept.
Would you like to be independent and clean your pipe systems individually and regularly or integrate your own Comprex® cleaning system into your operational processes? No problem, whether mobile or stationary – we have the right system for you and will train your staff.
"I wouldn't have believed it if I hadn't seen it myself at the Landau test center. In detailed trials cleaning our products in test pipelines, we reached up to 60% savings in cleaning time and up to 90% in water consumption."
"The MCU-300 from Hammann represents an important component of our innovative industrial hygiene concept. The system is used at Meffert AG both for flushing pipelines and for cleaning stand-alone systems.
The cooperation with the colleagues from Hammann has worked very well since the beginning of the project.
Project planning and commissioning were transparent and professional. All inquiries are processed promptly, and ideas and optimization requests are discussed openly with our technical department even months after commissioning.
The MCU300 is intuitive for our employees to operate, can be used almost anywhere due to its dimensions, and works very reliably."
"Before flushing the main pumping station, we had a pump runtime of almost 20 hours and a pumping capacity of 250 m³ of wastewater. As a result of the flushing action, we were able to determine that on some days we achieve a pumping capacity of 270 m³ of wastewater with a pump runtime of 15 hours. This clearly shows an improvement in the efficiency of our system.
"It is no longer possible to imagine our maintenance of injection molds without the cleaning technology from HAMMANN. The Comprex® cleaning is without alternative in very many applications. Thank you for the excellent and pragmatic service."
"The Hammann company was commissioned to clean the stainless steel gas pipe using their Comprex process. Success was already evident when the cleaning was carried out, as the escaping rinse water was heavily contaminated.
After cleaning and recommissioning, the aforementioned pressure fluctuations did not occur again. It was not easy to create the necessary inlet and outlet to the gas pipeline. It is also problematic to take a gas pipeline out of service for a longer period of time when there is no redundancy. Nevertheless, the effort was worth it, as the cleaning has had the desired effect."
"Our initial skepticism that comprex could be too intense for our piping system was unfounded. The pulse pressure always remains below the network pressure and so we don't have to worry about pipe bursts due to excessive pressure. The pulse flushing process can reduce the deposits in our old network so significantly that maintenance is absolutely economically viable compared to replacement."
"Our conclusion: The test of the Comprex® unit can be rated as thoroughly positive. The cleaning effect can be seen as very good, in some cases even blockages could be loosened. Due to the rather simple operation, the unit could be operated without any problems after the short instruction. No problems were encountered during the test phase.
At this point, we would like to thank you again for the test opportunity and the trust you have placed in us."
"We have had very good experiences with comprex and are very satisfied with the cooperation that has grown over the years. The Hammann GmbH technicians know our network, arrangements are quick and uncomplicated and the assignments are already a fixed part of our annual planning for network maintenance."
Cleaaning blocked culverts
Large sewage treatment plant
Large-scale sewage treatment plant
Discover our other municipal applications
Water extraction
Water distribution
Water distribution
Drinking water pipes, transport pipes, elevated tank pipes, main water pipes, house connection pipes
Wastewater disposal
Frequently asked questions about cleaning wastewater pressure pipes
How does cleaning with Comprex® work?
The process works with specifically controlled air-water pulses. These move through the pipe at high speed (up to 70 km/h) and generate strong shear and drag forces. This efficiently mobilizes and removes deposits, biofilms and solids – completely without chemicals and with minimal use of water.
Is cleaning with Comprex® suitable for all types of pipes?
Comprex® is suitable for a wide range of pressure pipes in wastewater technology – whether long transportation routes, pipes with large nominal diameters or sections with difficult hydraulics. Cleaning is individually tailored to the pipe length, material and conditions on site.
Can cleaning be carried out during operation?
Depending on the system structure, cleaning during partial operation is also possible. Our team will check the technical and operational requirements with you in advance – including bypass solutions or temporary detour.
How long does cleaning take?
The duration depends on the length, dimensions and degree of soiling of the pipe. Smaller sections can often be cleaned in one day, but for larger projects we plan the process in stages – efficiently and with minimal interruption.
How is the cleaning effect verified?
We document the discharge results visually and – if required – with additional measurement technology (e.g. turbidity data). This allows you to track and document the success of the measure.
What distinguishes Comprex® from a normal water flush?
In contrast to pure water flushing, Comprex® generates a significantly higher cleaning performance thanks to the impulse effect. This creates targeted forces that reliably remove even stubborn deposits and biofilms – effectively and in a resource-saving manner.





