A superb media for fluidised filters with a buoyancy near that of water which enables fluidisation with minimal energy input. The open structure of the media results in a higher void space than the BCN007 (below) and gives improved oxygenation, and higher efficiencies, for bacteria colonising the centre of the media.  See table below for a comparison of surface areas.

A superb media for fluidised filters with a buoyancy near that of water which enables fluidisation with minimal energy input. The cross structure of the media is a more "traditional" shape and is preferred by some users, especially those using the media in a "bead filter" type system where the media also acts as an excellent particle trap and can be fluidised easily for backwashing. See table below for a comparison of surface areas.

A dense media design which is excellent for denitrification and trapping fine solids. BCN017 is a very dense pattern and not particularly suited to aerobic (nitrification and heterotrophic) filtration systems where bacterial floc can clog the media and make it hard to clean. See table below for a comparison of surface areas.

A more open media type than BCN017 (above) the BCN030 is excellent for submerged and trickle biological filters and has excellent void space characteristics. The vane design of the media results in excellent water dispersion throughout you filter, maximising the use of the media surface area. See table below for a comparison of surface areas.

The open area of this media is ideal for both trickle filters and degassing towers. The shape of the media creates an excellent water distribution pattern through the column and the large open pattern gives excellent gas flow characteristics. See table below for a comparison of surface areas.