Granular type filters are widely recognized by water treatment experts as being “effective & reliable”

Typically a granular filter will provide a large filtering volume with the ability to accommodate high levels of suspended solids. Most importantly, granular filters can be simply cleaned, by reversing the water flow through the filter. Their backwashing operation does not require complicated operations such as draining, sluicing, or precoating.

The CGF product range can satisfy almost every conceivable requirement:-

  • Rapid, Medium or High Rate filters(with filter rates up to 42m3/hr/m2)
  • Mixed or Dual Media (using Hydro Anthracite & other filter medias)
  • Single or Multi media (With different bed depths & different medias)
  • Chemical Filtration (GAC, BAC, & many other diverse removal processes)
  • Horizontal or Vertical Filters (in various sizes & filter areas)
  • Single or Multiple Vessels (with individual filter areas up to 7.25m2)
  • Standard or Custom-made product (contactors, biological filter towers, carbon adsorbers, etc.,)
  • Different Backwash Methods (reverse flow, shunt, manual/auto)

CGF filters have been used on hundreds of swimming pools and are capable of providing benefits and features that are not simply available with many other sand filters.

Whilst CGF’s reputation in the swimming pool market is widely known and accepted, they are equally suitable for aquaculture, aquarium life support systems, waste water treatment, industrial applications, and special high pressure applications.



Given that CGF manufactures a comprehensive range of horizontal and vertical filters, they do not have a vested interest in any one type or form of filtration. It is however important to accept that CGF’s horizontal filters are able to provide maximum value for your filtration dollar. Conversely, vertical vessels are often technically warranted when different filter medias and processes are required and or specified.


Whilst CGF filters may appear to operate in a very similar fashion to older filters (that were made from steel or concrete) they differ quite radically in their hydraulic characteristics and their total plant size. By operating in excess of traditional slow filter rates, solids are retained within the depth of the filter media………. not just on the surface, as was the case with many early filters.

This fundamental difference has resulted in modern Australian-made filters that are able to satisfy any given volume through a bed, which is considerably smaller than any traditional rapid filter.

Although increased flow rates may appear to be a dramatic departure from early/traditional filter rates, this does not detract from their collecting efficiency.

The basic principle of “in-depth” filtration has resulted in filter plants that offer:-

  • More compact vessel designs.
  • Lower unit costs.
  • Less shipping weight.
  • Shorter installation times.


All CGF filters are manufactured from selected and proven resin systems in accordance with standard procedures that recognize the requirements of BS-4994, DIN 18820, and AS-2634. Standard vessels are designed and manufactured for a standard test pressure of 350kPa. Higher pressure ratings are available upon request.

CGF filters are supplied with hydraulically balanced filter internals and various filter connections and fittings. This includes a choice of access hatches, flanged inlet/outlet connections, screened drain, kinetic vent & vacuum breaker, pressure indication, and detailed installation and operating Instructions. For mechanical & chemical filtration, the CGF filter laterals are injection moulded from engineering plastics (ABS) with inward tapering ‘V” shaped opens that are in general accordance with DIN19605.