Vortex filter

A vortex filter is a filter used in rainwater harvesting systems to separate medium to large sized debris from the flow of water before entering a tank, cistern or further reservoir. A vortex filter does not collect debris, but allows it to flow through the filter, thereby minimizing maintenance. The filtered water flows through filter screen or mesh onto the end destination.

Picture of an installed vortex filter

The capillary effect is responsible for drawing water along the side wall of the filter element which is how the filtered water exits at a higher level than the unfiltered water. Rainwater flows in through a top port or inlet pipe, spins around the circumference of the filter body.

This filter requires less maintenance than other pre-filters, but at the penalty of reduced filtered water efficiency. Depending on intensity of flowing water, a typical vortex filter is 85% to 90% efficient.[1]

References
  1. Conservation Technology. “Rainwater Harvesting - Pre-Filtration.” Www.Conservationtechnology.Com, 2008, www.conservationtechnology.com/rainwater_prefiltration.html. Accessed 18 June 2020.
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