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The Parkson DynaSand® Filter is an upflow, deep bed, granular media filter that filters liquid suspensions to the designed effluent quality, while at the same time cleaning the sand bed so the filter does not shut down during the backwash period. Feed water is passed upwards through the sand bed and exits the rapid sand filter as clean water. At the same time, sand can be removed from the bottom, cleaned by a simple internal washing system that does not require backwash pumps or storage tanks, and returned to the top of the sand bed. A small portion of the filtered water is used to wash the sand and leaves the filter as a reject stream.

Our continuous backwash sand filter is available as either a standalone package unit or a modular concrete design. The package units are constructed of either 304 SST or FRP. Internal components for both package and concrete units are built with stainless steel and / or FRP. Filters are available in 40” standard bed or 80” deep-bed design depending on the nature of the application.

A concrete continuous backwash filter installation can be designed for any size area allowing the technology to adapt to any size water or wastewater treatment plant.

Concrete modules are frequently used for high-flow capacity systems and involve placing multiple modules into a common filter cell. The modules in a filter cell share a common filter bed where cones inside each module distribute sand to their respective airlifts and sand washers. During operation the pressure drop remains low and even throughout all filters. Equal pressure drop ensures even distribution of feed to each filter without the need for splitter boxes or flow controls. Therefore, a typical multiple unit installation can use a common header pipe with feed connections and isolation valves for each filter.

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Features & Benefits

Improved function

NEW segmented airlift
split into 3 manageable sections for easy installation

Improved function

HDPE airlift option
provides robust design with excellent wear resistance

Improved function

Single source responsibility
of air compressor, controls, valves, platforms, grating to increase process performance and minimization risk to owners

Water drop

Proven design and world leader
with over 40 years' experience and over 8,000 installations

Reduced Maintenance

No moving parts
to reduce maintenance

Reduced Maintenance

No backwash pumps, air scour blowers, mud wells, clear wells, etc.
to reduce maintenance

Cost Savings

Single granular media
– no need to purchase different size filter media


Filter always on-line during backwashing
to eliminate need for redundancy


Preview image for the video "Parkson DynaSand Filter - How it Works, Features and Benefits".
DynaSand® feed assembly which transfers influent water into filter
DynaSand® filter cell with four modules
Package Lamella Gravity Settler and DynaSand filter
DynaSand® EcoWash® Continuous Backwash Sand Filter
Internal structure of DynaSand® EcoWash®
Multiple DynaSand® EcoWash® units shown at installation site
DynaSand® EcoWash® air control panel
New DynaSand Segmented Airlift available with HDPE

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Case Studies