Tried-and-tested technology in a new design

The Backwash Drum Filter is based on the filtration and backwash principle of the Filterautomat. A customized selection of materials is possible for the most difficult media.

Its special design enables a filter fineness of 5 micrometers.


Technical data

Flow rate

max. m³/h

Filter fineness

> µm

Operating pressure

1.5 to bar


DN 100 to

Automatic cleaning


Filter housing

Steel, stainless steel, GRP


  • High cleaning speed (4-10 m/s)
  • 100% cleaning of the entire filter area
  • Low flushing water losses
  • Robust design
  • Shredding of coarse particles
  • Fine filtration ≥ 5 μm possible
  • Fitted with wedge-wire screens, wire mesh
  • Completely wired and tested unit

High productivity

The raw water enters the filter via the inlet flange and flows through the filter drum from the inside to the outside. The solids in the raw water are retained in the segment-like openings on the inner part of the filter drum located on the inside of the filter element. The purified water leaves the filter through the clean water outlet.



A differential pressure measurement in the raw water inlet and the 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 hollow shaft in the filter. Due to the excess pressure outside of the filter drum on the clean water side, the solids retained on the inside of the filter element are now forcibly backwashed into the atmosphere against the direction of filtration. The rotation of the filter drum and the flushing shoes attached to it 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. 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.




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



Backwash Drum Filter.pdf

1,92 MB

World of Filtration.pdf

1,56 MB

Form of Tender RTF.docx

0,02 MB



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 specially qualified and regularly trained staff. Our mechanical production and assembly departments possess extensive expertise.


Certified testing

Our certified quality management system allows seamless monitoring and control of all production steps. This always ensures early detection and eliminating faults, enabling us to provide the highest-possible quality level for you.


The team at your side

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


Ideal production conditions

Since 1941, we have executed all production and machining in our factory in Siegen, Germany. Our continuously improved, state-of-the-art range of machinery and our modern factory buildings provide an environment that is essential for manufacturing high quality products.