Choosing the right pressure washer is essential for the effective and gentle cleaning of paving stones. Whether you opt for a mobile petrol-powered model or a trailer system, this guide explains what really matters when making your choice.

• The choice between a trailer system and a mobile pressure washer depends on the application. Trailer systems offer an integrated water supply and high flow rates, while mobile petrol-powered units provide greater mobility and performance for large areas.

• The right pressure level prevents material damage and optimizes cleaning results. Carefully selecting the pressure and water flow rate is essential for cleaning different surfaces without causing damage such as erosion or cracks, while higher pressure levels may be required for stubborn dirt.

• Effective paving stone cleaning requires the right technique and appropriate precautions. Using surface cleaner attachments, maintaining the correct distance from the surface, and applying the proper spray angle ensure thorough yet gentle cleaning.

However, for surface cleaners to deliver their full cleaning performance, a sufficient water flow rate is essential.

Most models require at least 20 l/min, while around 27 l/min is optimal for many units.

For this reason, systems with a buffer water tank, such as the KB MINI or KB MAXI, are recommended to ensure consistent and efficient cleaning while preventing damage to the surface.

WHAT TYPES OF PRESSURE WASHERS ARE AVAILABLE?

Trailer systems with a buffer water tank, such as the KB MINI or KB MAXI, provide even greater independence. They are specifically designed for applications where a reliable water supply and high flow rates are essential.

The KB 200-20 MINI operates with a 360-litre water tank and a flow rate of 20 l/min, while the KB 270-27 MAXI is available with either a 360-litre or 500-litre water tank and delivers 27 l/min.

This makes these systems particularly suitable for operation directly from a vehicle and for use with surface cleaners that require a constant water supply.

Advantages: Maximum independence, integrated water supply, high flow rate, ideal for professional surface cleaning.

Disadvantages: Requires more space and is designed primarily for continuous professional use.

The most suitable pressure washer for paving stones therefore depends mainly on the application, the size of the area to be cleaned, and the required level of self-sufficiency.

HOW DO PRESSURE LEVELS DIFFER AND WHAT ARE THEIR APPLICATIONS?

HOW DO YOU CLEAN PAVING STONES PROPERLY WITH A PRESSURE WASHER?

To clean paving stones effectively, the correct application is essential. The first step is to carefully assess the condition of the surface.

This allows the cleaning process to be precisely adjusted and helps prevent potential damage to the material. Different materials and levels of soiling require tailored cleaning methods.

Surface cleaner attachments provide an ideal solution. They ensure even cleaning results while protecting sensitive surfaces through controlled water jet guidance.

This prevents streaking while still cleaning the paving stones thoroughly.

Another important factor is maintaining the correct distance between the nozzle and the paving stone surface.

Keeping an appropriate distance helps prevent structural damage caused by excessive pressure.

The combination of the correct spray angle and the appropriate water jet pressure ensures gentle yet effective cleaning. These factors help clean dirty paving stones efficiently while protecting the surface.

HOT WATER – A GENTLE SOLUTION FOR SURFACE PROTECTION

Hot water is particularly suitable for cleaning paving stones, as dirt can often be removed effectively with lower pressure.

As a general rule, lower pressure combined with a higher water flow rate provides especially gentle cleaning.

This allows even sensitive surfaces to be cleaned thoroughly without unnecessarily stressing the structure of the paving stones or the joints.

WHAT PRECAUTIONS SHOULD BE TAKEN?

WHAT ARE THE BEST PRACTICES FOR CLEANING?

Using circular cleaning movements prevents streaks and ensures an even cleaning result.

When using pressure washers on paving stones, slow and controlled movements are essential, as they optimize cleaning performance.

Cleaning agents increase cleaning efficiency. They should be applied evenly before cleaning to remove heavier dirt as effectively as possible.

This not only improves cleaning results but also contributes to the long-term durability of the surface.

WHAT PROBLEMS CAN OCCUR WHEN CLEANING PAVING STONES?

Excessive pressure during paving stone cleaning can cause structural damage. If pressure washers are not used correctly, pressure-related damage can occur, affecting not only the appearance but also the functionality of the paving stones.

Improper water jet guidance can destabilize the joint structure and lead to uneven surfaces.

• Excessive pressure can roughen the surface or even dislodge paving stones.
• Incorrect water jet guidance promotes washout, resulting in uneven surfaces.

To prevent long-term damage, it is essential to use a cleaning technique specifically suited to the paving stones.

This significantly improves both the maintenance and the service life of the paving stones.

Comprehensive training in pressure washing techniques and practical guidance are valuable tools in achieving the best results.

HOW HARMFUL CAN EXCESSIVE PRESSURE BE FOR PAVING STONES?

Excessive pressure from a pressure washer can damage the surface of sensitive paving stones.

Microcracks can form quickly, affecting not only the appearance but also leading to erosion. Over time, this erosion can weaken the structure and reduce the load-bearing capacity of the paving stones.

Excessive pressure can also remove the jointing material from the joints.

This compromises stability, as the material supporting the paving stones is washed away. The result is a combination of visual defects and structural damage.

Over time, unnecessary surface roughening and material loss may also occur, further reducing the stability of the paved surface. This significantly affects both the appearance and the functional performance of the paving.

WHAT SOLUTIONS DOES CLENA SOLUTIONS OFFER FOR EFFECTIVE PAVING STONE CLEANING?

CONCLUSION: WHICH PRESSURE WASHER IS THE RIGHT CHOICE FOR PAVING STONES?

Individual requirements play a key role in choosing the right pressure washer. CLENA Solutions provides well-designed solutions that adapt flexibly to different operating conditions, making them reliable long-term partners.

• Which materials and surfaces need to be cleaned?
• Which performance class meets your requirements most effectively?
• How robust and low-maintenance are the machines?

The result is reliable cleaning that combines efficiency with gentle surface treatment. This makes CLENA the ideal choice for specialised professional cleaning applications.

FAQ

Which pressure washers are suitable for cleaning paving stones?

For professional paving stone cleaning, petrol-powered pressure washers and trailer systems with a buffer water tank are the most suitable options. Mobile petrol-powered units offer excellent flexibility and performance, while trailer systems such as the KB MINI and KB MAXI also provide an integrated water supply and high water flow rates.

How do pressure levels differ, and what pressure is suitable for paving stones?

The pressure level of a pressure washer determines the effectiveness of paving stone cleaning. In most cases, a pressure of up to 150 bar is sufficient. Excessively high pressure can damage the surface and should be used with care to avoid cracks or erosion. CLENA Solutions offers systems with precise pressure adjustment to help prevent such damage.

What precautions should be taken when pressure washing paving stones?

Maintaining a safe distance from the cleaning surface is essential to prevent material damage. Using the correct spray angle and properly managing wastewater are also important considerations. Freshly sealed paving stones should not be cleaned in order to preserve the integrity of the seal.

What are the best practices for effective paving stone cleaning?

To prevent streaking and achieve even cleaning results, circular movements are recommended when using a pressure washer. In addition, using suitable cleaning agents improves both cleaning efficiency and overall results. Proper preparation and correct application help protect the material and extend the service life of the paving stones.

What solutions does CLENA Solutions offer for paving stone cleaning?

CLENA Solutions develops customised pressure washer systems and modular accessories that are perfectly suited to the requirements of paving stone cleaning. Products from the M2500 series allow precise pressure adjustment, while units such as the KB 200/20 MINI provide outstanding user convenience even in compact applications. This flexibility ensures efficient, economical, and surface-friendly cleaning results.

HOW DO I CHOOSE THE RIGHT PRESSURE WASHER FOR MY BUSINESS?

Choosing the right pressure washer is essential for efficient and cost-effective cleaning in commercial or industrial settings. But what truly matters when selecting the right unit? In this article, we provide an overview of the key criteria and help you find the perfect model for your specific needs.

1. What Are Your Requirements?

The most important question: What will the unit be used for? Is it simply for cleaning dirt, or do you need to remove entire surface layers?

2. Hot Water or Cold Water?

3. What Pressure Level Makes Sense?

120–170 bar → for light to medium-duty applications and general cleaning tasks
180–250 bar → for professional use in industrial and agricultural settings
>250 bar → for layer removal, e.g., wet blasting

Tip: More pressure isn’t always better – the key is the optimal balance between pressure and water flow. Thanks to the modular design of our machines, we can tailor this ratio to your specific needs.

4. Stationary or Mobile?

5. Electric, Diesel, or Gasoline?

6. Don’t Forget the Accessories

For specialized applications, having the right accessories is key:

•  Lances
• Hoses
• Nozzles
• Spare parts

At CLENA, we’re happy to advise you on a solution tailored to your industry and specific application.

Get in touch now or explore our product range directly!

Our DIN ISO 9001 Certification

We are pleased to announce that CLENA Solutions GmbH is now certified according to DIN ISO 9001 – an internationally recognised quality management standard that stands for consistent quality, customer satisfaction, and continuous improvement.

What is DIN ISO 9001?

ISO 9001 is an internationally recognised standard for quality management systems. It defines the requirements that help companies ensure efficient processes, meet customer requirements, and continuously improve their performance.

How do we implement ISO 9001 at CLENA?

Our quality management system has been implemented in a structured manner and meets all relevant requirements of the standard. From clearly defined processes and responsibilities to risk management, risk assessment, regular internal audits, and performance evaluations, we continuously measure, review, and improve our performance.

What does this mean for our customers?

Transparent and reliable processes: Our workflows are clearly defined and proven to be effective.

Reliability and trust: Certification by an independent body confirms our commitment to quality and operational excellence.

Continuous improvement: We are constantly working to develop even better solutions for our customers.

With our DIN ISO 9001 certification, we are sending a clear message: At CLENA, quality is not left to chance—it is systematically planned, implemented, and continuously improved.

Zertifizierung DIN ISO 9001

1. WHERE MOBILE SYSTEMS REACH THEIR LIMITS

Mobile pressure washers are designed for occasional applications at changing locations. In permanent cleaning processes, however, they reveal several typical disadvantages:

• Higher labour requirements: Units must be transported, connected, and stored after each use.
• Longer setup times: Connecting hoses, power, and water takes valuable time.
• Increased wear caused by transport and environmental exposure: This results in shorter maintenance intervals.
• Unplanned downtime: Mobile units are more susceptible to failures and are more difficult to standardise, which can interrupt operations.

2. STATIONARY PRESSURE WASHER SYSTEMS: CONSISTENT PERFORMANCE, RELIABLE PROCESSES

Once installed, stationary systems provide reliable cleaning performance at the push of a button – without setup times and with clearly defined operating processes. They are ideal for:

• Production areas with designated cleaning zones
• Workshops, wash bays, and vehicle depots
• Livestock facilities and milking parlours
• Hygiene-sensitive areas in the food and pharmaceutical industries

Connection to hose reels, pipework, or multiple outlet points allows several operators to work simultaneously without any loss of performance.

3. A COST-EFFECTIVE SOLUTION: PREDICTABLE COSTS AND RELIABLE PERFORMANCE

4. WHAT TO CONSIDER WHEN CHOOSING A SYSTEM

If you are planning to invest in a stationary solution, the following aspects should be taken into account:

• Pressure range and water flow: Matched to the application and type of contamination
• Material selection: Stainless steel, acid-resistant, and easy to maintain
• Energy supply: Electric, diesel, gas, or central heating circuit
• Accessory integration: For example, foam systems, dosing units, or automatic controls
• Service and spare parts availability: Essential for permanently installed systems

CONCLUSION: CONTINUOUS PERFORMANCE REQUIRES PERMANENT TECHNOLOGY

Businesses that carry out regular cleaning should rely on purpose-built technology rather than compromise. Stationary pressure washer systems provide a reliable, scalable solution for demanding cleaning applications and increasing efficiency requirements.

Would you like to find out whether a stationary solution is the right economic choice for your business?

We will be happy to advise you with a solution tailored to your specific application.

Functional, Efficient, Cost-Effective

Thanks to the modular design of our machines and the use of integrated standard components, we can respond flexibly to a wide range of requirements and design custom systems tailored to our customers’ needs. This is possible both in small series and as one-off solutions.

Maik Baumann, Project Manager at inprotec AG, comments:

“As a service provider in the field of fluidized bed drying, inprotec AG is constantly facing new challenges. One of the biggest ongoing issues has been the drying of sticky but water-insoluble components. These were previously extremely difficult to remove from the equipment components.

All the more reason we’re pleased to have found a competent partner in Clena GmbH to help us solve this problem. It’s particularly worth highlighting how quickly Clena responded with a potential solution after we described our challenges. Through close collaboration and several on-site visits, this idea was ultimately turned into a practical implementation.

The planning and commissioning of a cleaning tool tailored to our systems went hand in hand – through short decision-making processes and without major setbacks or complications. The unit is currently still being optimized, but even in this phase, many new ideas and solution approaches are being developed together. We’re confident that this implementation will again move us significantly forward. Thank you!”

Customers from a wide range of industries trust in their partnership with CLENA GmbH.

Let us show you what we can do — get in touch today so we can work together to develop a tailored solution for your specific needs.

We look forward to hearing from you!

We Are Excited to Welcome Axel Fink as the Newest Member of Our Team

With many years of experience in the international cleaning equipment industry, Axel Fink is well-equipped to take our sales strategies to the next level.

An Experienced Leader Joins the Team

Axel’s extensive background makes him a valuable asset to our company, bringing deep insight into the needs and challenges of our industrial clients.

“After nearly two decades in international business, I’m very much looking forward to contributing my knowledge and experience to CLENA,” says Axel Fink.

Committed to Environmental Responsibility and Quality

“I’ve been familiar with CLENA’s high-quality products for quite some time, and they’ve always impressed me. Built to a high standard and individually manufactured – I see tremendous potential here,” says the new Head of Sales, for whom sustainability is one of today’s most important topics. “These machines are extremely robust and repairable. With our equipment, we aim to set new benchmarks in sustainability.”

Visionary Goals for Growth and Expansion

Under Axel Fink’s leadership, CLENA will undergo a comprehensive modernization and expansion of its sales structures. Over the next two years, new sales personnel will be added to strengthen market presence. In addition, Fink aims to pursue various certifications to further highlight CLENA’s commitment to quality.

Driving Innovation in the Industry

According to Fink, CLENA is ready for a new surge of momentum.
“As CLENA Solutions GmbH, our goal is to position the company as a market leader in eco-friendly high-pressure cleaning and water jet technology. Furthermore, we want to lead the way in showing how sustainable practices and business success can go hand in hand.”

With Axel Fink heading our sales department, we are ideally positioned to achieve our ambitious goals and take the company to a new level of industrial leadership.

Feel free to reach out to him via our contact page or directly by email at info@clena.de.

Contact us to receive an offer tailored to your needs.

More than 40 years ago, CLENA’s story began as a Danish-German partnership. Over the years, the two companies followed separate paths and developed independently, but their shared DNA remains clearly visible to this day. Both companies stand for robust, durable equipment and customised solutions.

Today, we are delighted to announce that CLENA Solutions GmbH in Germany and Clena High Pressure Systems A/S in Denmark are returning to their shared roots by entering into a strategic partnership.

By combining our expertise and expanding our product portfolio, we are now able to offer our customers even more comprehensive solutions. Whether you are looking for high-pressure water systems for industrial applications or specialised cleaning equipment for a wide range of industries, we are ready to meet your requirements. Our partnership enables us to respond more flexibly and efficiently to your needs while providing customised solutions tailored to your business.

We look forward to working together with Thomas Juhl Stefansen and the entire team!

ÉT NAVN, ÉT STÆRKT BRAND, TO VIRKSOMHEDER

Det er mere end 40 år siden, at Clenas historie begyndte som et dansk-tysk samarbejde. I årenes løb skiltes de to virksomheders veje og fortsatte med at udvikle sig uafhængigt af hinanden, men deres fælles DNA er stadig tydeligt genkendeligt i dag. Begge står for robuste og holdbare apparater og skræddersyede løsninger.

Nu er vi glade for at kunne meddele, at vi som det tyske Clena Solutions GmbH vender tilbage til vores fælles rødder med Clena High pressure systems A/S fra Danmark for at indgå et strategisk samarbejde.

Med vores fælles ekspertise og en udvidet portefølje kan vi nu tilbyde dig som kunde endnu mere omfattende løsninger. Uanset om du er på udkig efter trykvandssystemer til industrielle anvendelser eller specialiseret rengøringsudstyr til forskellige brancher, er vi klar til at opfylde dine behov. Vores partnerskab giver os mulighed for at reagere mere fleksibelt og effektivt på dine behov og tilbyde dig skræddersyede løsninger.

Vi ser frem til at arbejde sammen med Thomas Juhl Stefansen og hans team!