DynaSand™ is a world-leading continuous sand filter developed by the Axel Johnson Institute in Sweden in the late 1970s. DynaSand is used to clean and produce water for drinking, industrial processes, waste water recycling and waste water treatment before the water is discharged into a recipient. With thousands of filters installed worldwide for municipal and industrial use, we have the experience and equipment necessary to exceed your expectations.

Product information

Continuous improvement
The range of DynaSand filters is under constant development and includes the latest developments of sand filters, such as material that is extremely resistant to the abrasions caused by sand that is in constant motion during normal operation. The advanced materials mean less maintenance and prolong equipment life. Additionally, you can optimise the sand cleaning rate (the sand/water ratio) with the help of two adjustable weirs with a specially designed wash box, which minimises losses when backwashing.

Uninterrupted operation
Uninterrupted operation provides several benefits over conventional backwashing sand filters. In conventional sand filters particles are collected in the sand bed with increasing pressure drop as a result, until finally the sand must be cleaned by backwashing before treatment can proceed. The time between backwashes can be very short, which reduces the effective operating time. It was not until the continuous sand filter technology of DynaSand was developed that it was possible to get an optimal solution to the need for continuous water and waste water treatment process while delivering a constant quality of the filtrate even at a high surface load.


DynaSand improves the process
• no first filtrate – always high-quality clean filtrate
• simple treatment of wash water, no shock loads
• handles high levels of suspended particles without requiring pre-treatment
• low pressure drop
• low energy consumption
• low monitoring and maintenance costs
• no need to stop for backwashing
• small footprint

DynaSand simplifies the system
• no need for backwashing pumps
• no tank for rinsing water
• no collection tanks for rinsing water
• no need of automatic valves for backwashing
• no blowers for purge air
• no nozzles with risk of clogging the filters
• only one filter medium
• system is simple to construct and maintain
• simple expansion for biological treatment

Examples of industrial applications
• metalworking
• wash water recycling
• process water
• side stream filtration of cooling water
• scale residues
• chemical processes
• ideal as pre-treatment instead of gravity filters


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