DVF Filter Technology

The Amiad DVF automatic filter has been engineered in the UK as a proven solution to all the problems effecting other high efficiency media filters that are or were available on the market. It is drinking water approved so the system can be incorporated in the most sensitive applications with the confidence of excellent performance.

The DVF filter system is a proven technology for the municipal water sector for both drinking water and tertiary plant operation. Multiple systems have recently been delivered globally for drinking water applications using varied water sources such as those originating from river and borehole. 

  The DVF technology produces excellent Total Suspended Solids (TSS) and turbidity reduction. It will maintain UV Transmittance (UVT) offering a
  high flow / small footprint rapidly deployable solution for out of compliance


The DVF filter range can deal with all industrial applications. It is successfully operating in applications such as cooling towers, river water abstraction, open process recirculation, as well as eradicating the need to use fresh water on once through processes. The 1 micron technology operates at typically 88% efficiency meaning significantly more solids are removed per pass through the filter than conventional media filters. This means smaller filters can be installed for the same equivalent flow resulting in lower Capex and Opex costs. Filters are resistant to biofouling making them very suitable for processes where a high level of microbiological material is present. No chemical use is required.


Salad producers and beansprout growers use the DVF technology as part of their wash systems to reduce water costs. Amiad has a number of partners who operate both in the UK and worldwide that use the DVF technology as the primary filter to remove organic material from the processes thus allowing their secondary treatments of UV or other hygiene products to operate effectively. Previously high cost disposable filters would have been the only solution for this application.

This technology is also chosen by one of the largest brewery organisation globally as the final stage in its effluent discharge to ensure compliance with discharge limits.

Food &

The DVF 1 micron technology lends itself to applications where very fine filtration is required for the process water and where oil is present. Unlike conventional media filters, the media rejects oil as the structure is more spherical and the surface has less crevices to host the oil and allow microbiological proliferation to take place. The product is readily producible in ASME construction, both stamped and non-stamped. The filter can also be produced in a variety of operating pressure ranges and materials.

The DVF technology has been operating in Middle East applications for a number of years as part of effluent treatment systems to ensure compliance with discharge limits to sea.

Oil & Gas

DVF technology is utilised by everything from Plastic moulders to data centres worldwide. The reduction of the fine material that coat heat exchanger surfaces means better biological control;  significant energy savings; reduction on wear and tear of pumps and valves etc within the system. Moulding setting times are reduced due to the enhanced heat transfer. Secondary treatment packages can be provided where glycol is present and the backwash needs to be recovered, removing only the contaminant.

Mobile units are available meaning older small capacity systems can be treated on a programed schedule so as the system cleans up it can be moved on to treat the next.

Closed Loop Heating & Cooling Systems

DVF Filtering Process

Untreated water enters via the inlet which is located at the top of the vessel and is passed through the patented DVF vortex generator. This pipe has a dual outlet configuration inside the vessel which generates a double vortex. This allows for the solids to be suspended above the filter bed. This leaves the water being cleaned free to pass through the specially constructed media bed with less resistance whilst giving the filter bed longer life before backwashing is needed. The filter bed is constructed of 4 different grades of active glass media which, unlike traditional sand, resists microbiological fouling. The cleaning process is achieved by backwashing the media.

The Self-Cleaning Process
Backwashing the filter bed is achieved by either a set time or, if backwashing is needed sooner, a pressure differential gauge which senses the Delta P when it reaches the pre-set value. Once this has been triggered either by time or pressure differential, then the self-cleaning process begins. The inlet valve shuts followed by the process water out valve. The backwash valve then opens followed by the drain valve. This forces the water being used for backwashing up through the nozzles at the bottom of the vessel, through the filter bed which lifts the solids from the top layer of the media. Once lifted off the bed it is discharged through the drain which is located at the top of the vessel. When the backwash is finished at a pre-determined time, the valves shut in reverse and the filter process is resumed.

The Control System
An AC controller allows for the backwash timings to be altered to suit the specific site requirements. It also allows for pumps to be added to the system to aid with process and/or backwash flow. There is also a manual backwash facility which will work in conjunction with the set time and differential pressure settings for the filters.


Tel. +44 (0) 1792 277 290
E-mail: info-uk@amiad.com


Unit 1
Heol Rhosyn
SA14 8QG