Disinfection, Washing

GEWA AF pre-washing machine with belt outfeed

With the innovative "Active Flume" washing system, floating products are pre-washed without additional mechanical stress, and the product flow is standardized. The GEWA AF sets new hygiene standards and reduces water consumption. It is ideally combined with a GEWA XL or GEWA 5000 in a processing line.

5,000 kg/hMax. capacity
Prewashing machine GEWA AF from KRONEN: prewash floating, particularly leafy products (salad and vegetables) without mechanical stress and absorb production peaks – up to 5 t/h

Your benefits

  • Gentle pre-washing of large quantities of floating product
  • Low water volume compared to capacity – thus extremely water-saving
  • Modular design and therefore individually adjustable
  • Special air section with an integrated sand trap for effective separation of sand, dirt and stones 
  • Latest hygiene standards and optimal cleaning, e.g. by a clean-in-place system
  • Pre-washing, disinfection and rinsing, as well as production flow standardized in one machine

Product groups


The latest hygiene standards and reduced water consumption: pre-washing of up to 5,000 kg of product per hour

The GEWA AF is used as a pre-washer to remove coarse dirt, sand and stones from light, sensitive products. Due to its method of operation, it is also used to absorb production peaks and therefore make the product flow more continuous. The GEWA AF stands in a processing line downstream from a cutting machine or a weighing system. It takes over the first washing step, which is normally followed by at least one further washing step with a suitable HELICAL washing machine such as theGEWA XL or the GEWA 5000 or GEWA 4000. The capacity depends on the product; for example, 400 to 1,500 kg of baby leaf, up to 3,000 kg of iceberg lettuce or up to 1,000 kg of baby spinach can be processed per hour.

The standard equipment of the GEWA AF includes a highly effective, gentle submergence module, an air module for separating out sand and stones and for loosening contamination, a module with an insect removal drum and a settling module in which sand and stones sink and are regularly flushed out of the machine by means of the sand trap and an automatic valve, while the cleaned product is discharged via the outfeed belt. The side fine particle removal drum continuously filters the water as it runs into the filter tank.

The pre-washer is designed for lettuce, baby leaf and leafy vegetables (whole or cut) as well as floating cut vegetables, such as cabbage and cauliflower or broccoli florets. 

The other GEWA washing machines are suitable for non-floating products.

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High capacity salad and leafy vegetables processing line - teaser
The innovative processing line is technically state-of-the-art and sets new standards especially in the field of hygiene. The line is designed for large-scale industrial processing. It includes the GEWA XL and GEWA AF washing machines, the latest washing technology, and the K850 drying system, a system for gentle drying. In the line, these are combined with machines from KRONEN partners Synergy Systems, HiTec and Optimum.
Automated processing line for salad & leafy vegetables with high capacity & new washing technology
The innovative processing line processes up to 1,000 kg of baby leaf lettuce or the equivalent amount of mixed lettuce or leafy vegetables per hour. The highlights of this processing line include • the GEWA AF pre-washing machine, a new development by KRONEN; • the further developed GEWA XL helical washing machine; and • the K850 drying system, a further development of KRONEN’s K650 model.
GEWA AF prewashing machine with belt discharge for lettuce and vegetables: up to 5t/h
With the innovative "Active Flume" washing system, floating products are pre-washed without mechanical stress and the product flow is unified. The GEWA AF sets new hygiene standards and reduces water consumption….
High-capacity processing line for salad and leafy vegetables – brief overview
The innovative processing line boasts state-of-the-art technology and sets new standards, especially with regard to hygiene. The system is designed for industrial processing on a large scale. It contains the latest washing technology in the form of the GEWA XL and GEWA AF washing machines and also includes the K850 drying system for gentle drying.


GEWA AF and XL from KRONEN: the product coated in water slides via a water chute into the wash tank

Water chute for gentle product infeed

The submergence module places the light and sensitive product underwater without additional mechanical stress. The product falls onto a water chute where it is surrounded by water from all sides. Safely packed in the water, the leaves slide into the wash tank. No mechanical or even powered installations are necessary to submerge the product. 

The prewashing machine GEWA AF from KRONEN has a special air section with integrated sand trap for the effective separation of sand, dirt and stones

Air section with integrated sand trap

Six independently controlled air distribution boxes supply the entire section with air. The air bubbles bring movement into the tank and create currents that submerge the product. The leaves are further separated from sand, dirt and other foreign objects. A sand trap is integrated into this module, which catches the sand loosened from the leaves. Here, too, a special focus was placed on hygiene and easy cleaning. 

The prewashing machine GEWA AF from KRONEN has an insect and fine particle discharge with an extended surface – for optimum separation of insects and fine particles

Insect and fine particle removal system with an extended area

The insect removal system in the GEWA AF has a particularly large cross section and an extended contact area to separate the insects floating on the surface from the leafy product. The insect drum can be easily swiveled out of the wash tank, for example for cleaning. It also has an open design for easy access. At the same time, operational safety is guaranteed.

The prewashing machine GEWA AF from KRONEN uses very little water for its capacity: it works with a 4-to-1 water-to-product ratio

Process large quantities with a low water volume

The water-to-product ratio in the GEWA AF is only four liters of water to one liter of product. This ratio is ideal for pre-washing: cell sap, sand and dirt can be removed. The total wash tank capacity of the GEWA AF in the standard version is 1,400 liters of water. This makes the machine particularly water-saving in relation to its capacity.

Prewashing machine GEWA AF from KRONEN with the latest hygienic design for high hygiene standards as well as simple and fast cleaning and maintenance

The latest hygiene standards

When it comes to hygienic design, the GEWA AF sets new standards. For quick and easy cleaning, everything inside the wash tank has an open design and there are no air pipes. The GEWA AF pipes can also be completely disassembled. In order to clean the pipe system without needing to disassemble it and to ensure the lowest possible water consumption, a clean-in-place system can be integrated as an option.

With its modular, compact design, the prewashing machine GEWA AF from KRONEN allows great flexibility and adaptation to individual requirements

Modular design for flexible use

Thanks to its modular design, the GEWA AF can be used flexibly. Depending on the product and requirements, various combinations are possible and modules can be added, replaced and reproduced. For example, two air modules can be combined (see fig.). The machine is also available in a mirrored version. As a pre-washing machine, it also comes as a shorter version without an insect removal drum.


KRONEN SMART Factory, SMART Machines: In future, wherever production managers, technicians or foremen might be, they can check the production status of the machine or line on a laptop or mobile end device at any time
SMART Solutions for intelligent, networked production

KRONEN uses its SMART option to provide communication-enabled machines and processing lines. Wherever production managers, technicians or foremen might be, they can use these solutions to check the production status of a machine or line on their laptop or mobile device at any time. The collected data can be used to make production processes even more transparent and efficient, for example with regard to productivity, flexibility, quality and safety. Do you have special requirements? We can develop an individual, tailor-made solution for you.

SMART Solutions

Cleaning trolley for the lateral fine particle removal drum

The trolley makes it easier to clean GEWA and HEWA washing machines. The lateral fine particle removal drum can be taken out of the machine and placed on the mobile trolley, on which it is easy to transport and clean.

500 - 5,000 kg/h
Wet disinfection

The capacity depends on factors such as the product.

Electrical power Power 16 kW
Voltage 3~400 V N/PE
Frequency 50/60 Hz
Water Fresh water connection 3/4 inch (GEKA coupling)
Water drainage 3"
Total volumes 1,400 l
Air Working pressure 6 bar
Air consumption 58 NL/min.
Dimensions LxWxH 7722 x 1996 x 2242 mm
Weight 1850 kg
Infeed/placement height 1540 mm
Outfeed/delivery height 1861 mm
The data indicated are standard information. In addition, adaptation to other supply networks (e.g. 230V/60 Hz) is optionally possible (except for manual and pneumatic machines). Subject to changes.

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Machine illustrations can include special accessories.