Disc filters

Disc filtration offers the benefits of deep filtration, similar to media filters, but with much more efficiency, similar to screen filters.

For example, automatic disc filters have an average 20 second back-flush time compared to an average 120 second back-flush time for media.

Less water is lost due to back-flush, approximately 50% less compared to media. Furthermore, automatic disc filters have an average 70% smaller footprint than equivalent media filtration systems.

Disc filtration is ideal for situations where you have high organic matter due to the three-dimensional filtering through the discs.

A limitation of disc filters is the maximum flow. The largest model offered by Rivulis has a 300 m3/hr (1,320 gpm) flow (for average quality water). Although disc filters can be built together in arrays, the complexity of this array must be considered.

How they operate

Water passes through stacked polypropylene discs, which are a form of “three-dimensional” barrier. The water passes from the outside in.


For automatic disc filters, a back-flush cycle is initiated when the pressure differential drops below a prescribed level and/or at set time intervals.

During this process, each filter pod will individually open a back-flush valve to reverse the flow of water to clean the discs and expel the water.

Disc filter operation

Disc filter back-flush

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