Data center cooling


ALF filters

Maintain the thermal performance of your plate heat exchangers and tubular condensers by making sure there is no debris or other undesirable materials in the water used in secondary cooling systems, via a highly effective automatic flushing filter.

Fouling and clogging can have serious effects, reducing efficiency of heat transfer and limiting the speed at which water can flow through the heat exchanger.

ALF is a very cost-effective way to avoid these problems and ensure a reliable supply of clean cooling water.  


Watch the video to see how ALF filters work

ALF can easily be cleaned either automatically at predetermined intervals, or manually by pushing a button on the control panel.

During normal operation, the liquid enters the filter basket, which is divided into an inlet section and a debris collection section by the flow diverter. The flow diverter is open and the flushing valve located at the outlet of the debris collection section is closed. The liquid passes through the inlet section where it is forced through the filter basket before then passing through the outlet. The velocity of the liquid is sufficient to dislodge and remove any matter embedded in the inlet section of the basket.

In primary flushing, the flushing valve opens the flushing outlet, thus increasing the total flow through the filter. This loosens any debris sticking to the pipe walls and to the filter basket. This debris is flushed out to the drain through the flushing valve.

In secondary flushing (commonly known as backflushing), the flow diverter closes while the flushing valve remains open. The liquid flow is then diverted and forced to pass through the filter basket in the inlet section. The majority of the liquid leaves the filter through the main outlet but the pressure in the filter draws part of the flow from the exterior to the interior of the debris collection section. This provides a backflushing effect on this section of the filter. Any dislodged material is discharged through the flushing valve. 



  • Cost-effective solution to eliminate clogging, fouling and corrosion
  • High filtering capacity with low pressure drop reduces energy costs
  • Easy and safe operation takes advantage of available secondary cooling water from the sea, lakes or rivers
  • Effectively remove mussels, seaweed and other forms of marine life that can clog gasketed plate heat exchangers



  • Pressure vessel casing made of stainless steel, fiberglass reinforced polyester or rubber-lined carbon steel
  • Internal cylindrical filter basket made of stainless steel, super stainless steel or titanium
  • Your choice of three control systems from basic to 2Touch, which provides a complete overview of operating data
  • Available with connections ranging from 4" to 32"
  • Designed for placing directly in the pipe system
  • Automatic flushing occurs at regular intervals without interrupting the filtering process



ALF filter technical product brochure

ALF filter control systems technical brochure

Data center brochure


Contact us for more information.