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Continuously Washing Up Flow Sand Filter

Purification solution for water and wastewater applications

Multiple Continuously Washing Up Flow Sand Filter at a treatment plant

No more backwashing: Our Continuously Washing Up Flow (CWUF) sand filters are deep bed gravity filters, that continuously self-clean during operation.

Continuously Washing Up Flow Sand Filters: Efficient and Self-Cleaning

The SIEBTECHNIK TEMA Continuously Washing Up Flow (CWUF) Sand Filters are deep bed gravity filters that are designed to continuously self-clean during operation. This feature eliminates the need for backwashing equipment such as pumps, tanks, piping and instrumentation, simplifying both operation and maintenance. With no need to shut down for backwash cycles, our filters provide uninterrupted service.

Our CWUF Sand Filters have a deep sand bed with an effective depth of 2 meters, providing excellent filtration and sludge holding capacity compared to conventional media filters. This depth is key to their effectiveness in various water treatment processes.

100% Australian made at our Revesby, NSW factory, these filters have a proven track record of excellence. Over the past 30 years, we have supplied more than 155 CWUF filter units of various sizes, tailored to a wide range of applications. These include the purification of raw water for drinking and processing, as well as the treatment of wastewater and industrial effluents.

Benefits of the CWUF Sand Filter

Continuous Operation:

  • Eliminates the need for shutdowns for backwashing, ensuring uninterrupted service.


  • No need for backwash water storage or backwash water pumps.
  • Automated filtration process without the need for automatic valves.
  • Uses single media for efficient filtration.
  • Designed with no moving parts for simple and straightforward operation.
  • Minimal wear and tear due to sturdy design.


  • Modular design allows for easy expansion to meet growing needs.
  • Compact design saves valuable space.
  • Versatile installation options, including free-standing units or integration into concrete tanks.

Operating Economy:

  • Low pressure drop and air consumption increase overall efficiency.
  • Automated and trouble-free operation.
  • Low maintenance requirements, reducing maintenance costs.
  • No need for spare parts, further minimizing operating costs.
Continuously Washing Up Flow Sand Filter, feed and the filtrate
Continuously Washing Up Flow Sand Filter
Continuously Washing Up Flow Sand Filter DST30 on site
small Continuously Washing Up Flow Sand Filter

Optional Extras

Every Continuously Washing Up Flow Sand Filter includes: sand media, filter lids and a local control panel. We generally offer the following optional extras:

  • Platform and staircase to provide access to the top for operational and maintenance purposes
  • On site installation by our service technicians
  • On site commissioning assistance by one of our engineers


Material of Construction

We carefully choose the material of construction, depending on the unique site conditions and feed water characteristics, where the most common materials are:

  • Epoxy coated mild steel
  • 316 stainless steel


Site Requirements

Compressed air is required on site, which must be supplied to the control panel at 5-7 bar supply pressure. Air flow required depends on the filter size and can be advised after model selection.

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