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Extremely robust automatic filter

The Filterautomat boasts an extremely robust design and excellent backwash performance. The rotating filter drum distributes any solids uniformly over the entire filter surface and filters them out effectively.

Due to its robust design, larger particles such as branches can be crushed and safely discharged.


Technical data

Flow rate

max. m³/h

Filter fineness

> µm

Operating pressure

0.8 to bar


DN 50 to

Automatic cleaning


Filter housing

Cast iron, steel, stainless steel


  • High cleaning speed (4-10 m/s)
  • 100% cleaning of the entire filter area
  • Shredding of coarse particles
  • Fine filtration ≥ 25 μm possible
  • Uniform feeding of the entire filter area
  • Fitted with wedge-wire screens or wire mesh
  • Inline design
  • Completely wired and tested unit

High productivity

The raw water enters the filter via the inlet flange and is distributed in the outer ring of the housing. Then the raw water rises upwards in the filter housing and flows into the three-part filter drum. In order to guarantee a uniform feed of solids on the filter element, the filter drum rotates at about 5-7 rpm. The solids in the raw water are retained in the segment-like openings on the outer part of the filter drum located on the outside of the filter element. The purified water leaves the filter through the clean water outlet.



    A differential pressure measurement made between the raw water inlet and clean water outlet determines the degree of contamination of the filter element. At a defined differential pressure, the backwash process is activated. An adjustable time relay in the electrical control system additionally enables the backwash process. At the start of filter cleaning, the motor-driven backwash valve opens, generating atmospheric pressure in the backwash line and the flushing channels in the filter housing.

    Due to the excess pressure inside of the filter drum on the clean water side, the solids retained on the outside of the filter element are now forcibly backwashed into the atmosphere against the direction of filtration. The rotation of the filter drum past the flushing channel guarantees the 100% cleaning of the filter basket. The flushing process is complete after 15-20 seconds and the backwash valve is closed automatically. Filtration is not interrupted during backwashing.


      Drum roll

      The filter drum consists of a sturdy inner and outer support basket. The filter element is located between these support baskets. The conical design allows the three individual parts to be fixed and screwed together with perfect dimensional accuracy. To give them special protection against corrosion, a high-quality powder coating is applied to the support baskets.

      Sectional view

      During assembly, the upper part of the filter is inserted into the filter housing, with the lower part of the filter drum being centered in the filter housing by a ring surface.


      Wedge-wire screen filter element

      The segment-like openings of the outer part of the filter drum can also retain coarser particles. These are then flushed out of the system
      during the backwash process.

      Complete Filterautomat

      The filter housing contains two flushing channels situated opposite to each other. To prevent raw water from entering the flushing channels during the backwash process, the flushing openings are sealed off all around with sealing surfaces. The filter housing is coated with a standard two-part epoxy resin.



      Mussels and mussel larvae are fast becoming a major threat to industry. Once mussels or their larvae are in your system, they can multiply unhindered and incapacitate entire pipeline networks. The unique MUSSEL STOP system from DANGO & DIENENTHAL offers reliable protection for your plant components against unwanted mussel infestation, thereby minimizing breakdowns and maintenance costs.

      Mussel Stop

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      Filterautomat (DDF).docx

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      Filterautomat (DDF).pdf

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      MORE PURITY.pdf

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      We will make sure that you get the filter that is perfectly tailored to your application. Our engineering office will design the filter to match your operating parameters. Our product is thus tailored specifically to your application.


      Experienced partner

      All DANGO & DIENENTHAL filters are handled by our specially qualified and regularly trained staff. Both our mechanical production and assembly departments have extensive expertise.


      Certified testing

      Our certified quality management system enables seamless monitoring and control of all production steps. This ensures early detection and troubleshooting, allowing us to offer you a high level of quality.


      The team at your side

      If you require staff for training or maintenance at your company, don’t hesitate to contact us. Our specially qualified employees will be happy to assist you.


      Ideal production conditions

      We have been producing filters in our factory in Siegen, Germany, since 1941. Our continuously improved, state-of-the-art range of machinery and modern factory buildings provide an environment that is essential for manufacturing high-quality products.