The filter units are available in various sizes from 24" (500mm) to 96" (2400mm) and can be installed in different ways. The filter can be used as a stand-alone filtration system, utilising the existing process supply pump, or, if used as a by-pass filter, can be equipped with its own pump. Filters can also be installed in multiple treatment units on common pipework, which allows for unlimited filtration capacity of the system. The backwashing of the filter system can be carried out manually, semi-automatically or fully automatically and can be activated by a manual button, PLC, pressure differential or management system respectively. The backwash cycle and backwash time is adjustable and is set at 3 minutes at the factory. This control is achieved by the PLC automatic filter control system.

1、 High filtration speed, low pressure loss, completely solve the problem of slow filtration speed and small flow rate of common mechanical media filter.
2. Modular setting, small footprint, less piping, saving investment. The floor space is reduced by more than 40% and the amount of piping work is reduced by more than 50%.
3、 Manual, semi-automatic and automatic backwashing can be selected to fully meet your needs.
4、 Backwashing water source can be selected from the system, water tower or external source, and can be automatically switched (when special requirements).
5、 Multiple units can be combined and the processing flow can be expanded at will.
6、 The shell and pipeline are made of carbon steel Q235B, also can be made of stainless steel.
7、 The core components are imported (BERMAD, BACCARA, SIEMEN, MITSUBISHI).
8、 The filter unit is designed with a single chamber, with better backwashing effect and lower sand run-off rate.
9、 The water collector is available in stainless steel/ABS for longer life. 10、The outlet pipe is set at the bottom of the unit, with less water resistance and more convenient maintenance.

Filtration status
The shallow sand filter consists of a number of filtration units combined side by side. When the system is in the filtering state, the unfiltered water is evenly distributed through the unique water distributor developed by the company, and the water passes through the filler layer (refined homogeneous quartz sand) in the filter in a laminar flow. When the water flows through the packing layer, impurities are trapped in the packing layer. There are several evenly distributed water collectors at the bottom of the filter to collect and draw out the filtered water evenly. The level flow filtration enables the filter to filter at high flow rates and still achieve a good filtration effect.

Backwashing status
As impurities continue to accumulate in the packing layer, the internal pressure head loss will continue to increase. When the inlet and outlet head loss reaches the set value, the system will automatically activate the differential pressure device to convert it to the backwashing state, and when this backwashing is over, the hydraulic valve will change the direction of water supply to achieve backwashing one by one, which is more convenient to clean the accumulated impurities. When the system is in the backwash state, filtration still continues, where the standard unit sand cylinder to be backwashed is not filtered, but the other standard unit sand cylinders in the system are still filtering. The filtered clean water is partly used to backwash the standard unit grit cylinders and the rest is still sent to the customer. The backwash effluent is discharged through the backwash drain in the hydraulic valve. In the high efficiency filtration system for high speed sand cylinders, the special collector design allows the fillers to be scrubbed against each other, maximising backwashing efficiency and reducing the amount of backwash water required (clean water), while at the same time backwashing without running material. A standard unit of sand cylinder backwashing for 3 minutes, backwashing is completed, the standard unit of sand cylinder internal pressure head loss reduced to a reasonable range, the pressure setting device to give a recovery signal, hydraulic valve back to the filter state, the next standard unit of sand cylinder is ready to enter the backwashing state, the system can also be controlled by time backwashing, the default 4 hours backwashing once, according to the working conditions of the site to adjust the time, dual system control is not divided into primary and secondary, which first.