Automatic backwash filter


A type of self-cleaning filter called an automatic backwash filter has several stainless steel filter elements and can filter continuously for 24 hours.

It can efficiently remove solid particle pollutants from various low-viscosity liquids, including rolling emulsions and water, ensuring that the liquid cleanliness meets system operating and downstream process requirements while also safeguarding important downstream equipment. It is widely utilized in oil and gas, metallurgy, water treatment, pulp and paper, maritime filtration systems, and other industries.

Brother Filtration designs and manufactures the automatic backwash filter while taking all needs into account. We have inner corrosion paint to resistant the seawater. In addition, multiple types of valves, housing materials, and seal materials can be chosen by customers according to their actual needs.

Work Principle

Unfiltered liquid enters the automatic backwash filter from the input, passes through the central distribution tube, moves to the top of the filter, and enters the filter elements from there. The remaining 50% of the liquid does the same.

The remaining portion of the liquid enters the filter’s components directly from the bottom. The unfiltered liquid enters the filter elements simultaneously from the upper and lower ends and exits the outlet after filtering.

The automatic backwash method starts when the pressure decrease or the amount of time reaches the predetermined value. While the filtration process is still going on, the gear motor drives the back-flushing rotating arm to backwash the filter elements one at a time.

The sliding block covers the upper end of the filter element during backwashing, at which point the back- flushing valve opens. The clean filtrate reversely flushes the filter element’s inner surface due to the pressure difference between the filter element’s exterior and back-flushing outlet. The sewage pipe is used to release the contaminants that have been cleaned down.




If you are looking for a 24h unstoppable filter, then automatic backwash filter would be a nice choice. It is suitable for low-viscosity liquids filtration and is designed to protect the downstream equipment.

  • Able to remove particles from low-viscosity liquids
  • Suitable for various industrial applications
  • Protection for the downstream equipment
  • Customization service is available for special requests
  • Improve efficiency with less downtime

Brother Filtration Automatic Backwash Filter is competitive with ability to do continuous filtration and self-cleaning during backwash. It can largely reduce the downtime and save labour, and accordingly improve the system efficiency.

  • Automatic online continuous filtration
  • Reduce downtime and maintenance costs.
  • The control system can be tailored to monitor pressure and time settings for various fluids
  • High precision, large effective filter area
  • Small pressure drop and high backwash efficiency.
  • Compact design requires minimal space and is easy to install
  • The inlet and outlet ports are adjustable according to end users’ requirements
  • Filter rating 50–2000 μm

Filter element type V-slot slotted metal filter element, SS304, SS316L
Filter housing material SS304, SS316L, Carbon Steel, Customized
Inner corrosion protection Epoxy paint, PA11, or rubber Lining for seawater resistance
Housing seal material NBR/EPDM/VITON
Applicable liquid Raw water, cooling water, process water, and low viscous liquid (< 40 mPa.s), impurity < 300 ppm
Filter rating 50μm~2000μm
Flow rate range 17m³/h~10560m³/h
Inlet&Outlet size 2″– 24″/DN 50 – DN 1000
Fluid working temperature 0~95℃
Standard design pressure 0.7MPa~1.0MPa
Self-cleaning differential pressure 0.05MPa~0.07MPa
Minimum operating differential pressure Differential pressure between the outlet and back-flushing outlet > 0.15 MPa
Control system Based on the SIMENS controller, the parallel control mode of differential pressure and time
Gear motor 180W/370W, 3-phases, 380V, protection class IP55, CCWU
Valve actuator Pneumatic or electric, IP65
Back-flushing valve Wafer butterfly valve/full-port ball valve
Supply facility requirement 0.4–0.6 MPa clean and dry air, 380V AC

How do backwash filters compare to normal filters?

Backwash filters and normal filters serve the same purpose of filtering liquids to remove contaminants and sediments. However, the main difference lies in how these filters are cleaned and maintained.

Normal filters with disposable filter elements require regular manual checking and cleaning to ensure cleanliness and efficiency. Negligence in maintenance can lead to shortened filter lifespan and increased financial burden for the company due to frequent servicing and part replacement.

Backwash filters utilize a force-cleaning mechanism that expels accumulated contaminants through a backflush drain valve. Maintaining backwash filters is much easier as they do not require periodic servicing. Moreover, backwash filters, especially automatic ones, have a longer lifespan, resulting in time and cost savings in the long term.

What are the advantages of Automatic Backwash Filters?

Automatic backwash filters offer several advantages, making them a preferred choice for various filtration applications across different industries.

Continuous Operation

Automatic backwash filters can perform continuous filtration without the need for manual intervention. The automated backwashing system ensures that the filter remains operational even during periods of heavy contamination, minimizing downtime and optimizing filtration efficiency.


One of the main advantages of automatic backwash filters is their ability to self-clean. They have the capability to disrupt the granule structure and force accumulated particles into a suspension. The backwash freshwater is then sent through the filter bed, pushing the suspended particles into the backwash troughs. This self-cleaning feature reduces the need for manual cleaning or maintenance, saving time and effort.

Efficient Filtration

Automatic backwash filters are designed to enhance filtration efficiency by removing suspended solids and particles from the filter media. The backwashing process helps dislodge and flush away trapped particles, maintaining optimal filtration performance. This is particularly beneficial in applications where clean and filtered water is critical, such as in industrial processes or water treatment systems.

Minimized Contamination

By continuously removing accumulated particles and suspended solids, automatic backwash filters help minimize the risk of contamination. This is important in industries such as food and beverage, pharmaceuticals, and water treatment, where maintaining clean and pure water is crucial.

What Can a Backwash Filter Remove?

A backwash filter effectively removes a variety of contaminants from liquids, including sediments like sand and rust, organic matter such as algae and bacteria, chemical pollutants like chlorine and pesticides, heavy metals like lead and mercury, as well as iron, manganese, and turbidity.

Why is Backwashing Important?

  • Backwashing clears accumulated debris and contaminants that can hinder filtration efficiency. Over time, filters gather dirt, sediment, and organic matter, leading to clogging and reduced water flow. Backwashing flushes out these particles, ensuring optimal filter performance.
  • Backwashing maintains optimal flow rates. Accumulated debris can decrease flow, resulting in reduced water pressure. Backwashing dislodges obstructions, improving flow throughout the system.
  • Regular backwashing extends filter lifespan by preventing clogging and reducing stress on the filter media. It ensures continuous functionality and efficiency over time.
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