Skip to main content

Filtration knowhow – How does it work?

In this section we want to explain how the self-cleaning filter are working and inform about all the benefits of the Auto-line liquid filter solutions in your production.

How does the Auto-line self-cleaning filter work?

Check out our new animation videos and see how the self-cleaning filters are working.

Auto-line self-cleaning filter – Rotating version

Auto-line self-cleaning filter – Cylinder version

2 reasons for filtration:


Protection of pumps, heat exchangers, valves, boilers, pipes, regulation, and spray equipment against dynamic damages from larger impurities or erosion.


  • Modifying the end product securing the quality.
  • Remove unwanted particles and amalgamations.
  • Retaining valuable particles in the liquid

Inside view of the Auto-line filter (rotating version) when scraping off particles to be discarded.

What is a self-cleaning filter?

Self-Cleaning filters are used for continoues operation without any need for replacement of filter consumables and without exposure of the operator.

HiFlux Auto-line filters are designed as compact self-cleaning automatic filters with a wide range of applications. The sturdy construction of the filter makes it well suited for industrial and hygienic applications in which operational reliability and dependability are essential.

The Auto-line filter is used when an automatic continuous cleaning process is required. The impurities are being concentrated in the filter, until it is drained away, while the filter is still in operation the liquid loss due to cleaning is minimal.

The Auto-line filters are available as rotating and cylinder versions. The scraping process is driven by either an electric gear-motor or by a pneumatic actuator. The Auto-line filter is also available with an extended pneumatic cylinder for food applications. When filtering food applications it is important, that cross contamination between the liquid to be filtered and the pneumatic system is avoided.

In the design of the filter it was very important to make the construction robust and reliable. By limiting the number of moving components, wear and maintenance requirements are minimized. The simple construction makes the filter very easy to service, since there is no need for external service assistance or special tools. Furthermore, the compact design of the filter is making it suitable for locations, where the height is a limitation.

How does it work?

Working principle of a self-cleaning filter

The filtration principle is based on filter elements, with the particles being retained on the inside surface of the filter element. In the cleaning process the particles is scraped into a sludge chamber from where it is drained away from the filter at appropriate intervals. This results in a defined and absolute cleaning of the filter.

Drainage is controlled individually, which means that the loss of medium is reduced to an absolute minimum in connection with sludge removal.

During filtration/ cleaning a number of knives scrape the inside surface of the filter element and then leading the particles into the sludge chamber at the bottom of the filter. The principle is working like a rotating screw. This principle means, that the filter gains a large particle capacity due to frequently scraping. The flow through the filter is continuous during the scraping period, which means, that the filter can work continuously and the flow is not interrupted.

Drainage of the filter takes place through the bottom valve, which can be set to be activated after a certain period of time. This results in the particles being concentrated before it is pushed out of the filter. Hence the product loss is reduced to a minimum.

Draining usually takes place within a period of 1 – 3 seconds where a minor fall of pressure can occur. The flow in the filter will only be reduced by about 5 – 10% during the short period the drainage takes place.

Addons for the Auto-line filter
We have a wide selection of addons to the Auto-line filter, which increases the possiblities to customise the filter to your specific needs and further improvement of your final end product.
Click here to check out the addons section. 

Service of the Auto-line filter?

Check out the videos and see how easy it is to perform a service of the rotating and linear filter versions.

Click here and see our service videos.

Viscosity knowledge

What is viscosity and how important is it when filtering different medias with the Auto-line filter.

You can also learn more about viscosity in genereal and see our video to see how fast or slow different medias flow.

Click here and learn more about viscosity.

When to use a self-cleaning filter?

Choosing a self-cleaning filter solution offers several benefits:

  • Too high product loss due to frequent replacement of filter bags
  • Downtime due to blocked strainer or bag filters
  • Too high operational costs on manual filter solutions
  • Product recall or re-filtration due to impurities in the final product
  • Batch rejection due to burst filter bag
  • Too high costs for (hazardous) waste removal (filter bags)
  • Operator contact with hot and hazardous liquids
  • Clogged up UF and RO systems
  • Too long filtration time on existing filtration solutions
  • Ingress of foreign bodies and foaming problems in open filtration systems like vibration sieves
  • Food safety concerns due to operator contact