An activated carbon cartridge with filter screen that you can slip into place without even getting your hands wet, and a Bio Grid Cartridge that enhances biological filtration and guarantees optimum colonisation of nitrifying bacteria.

And a very tough clear view plastic tinted to stop harmful UV from killing the friendly bacteria, but light enough so that you can see the full working of your filter, and when it needs a clean.

Has a whole range of uses in filters ranging from baby box filters to BiOrb filters and pressurised filters. An excellent filter medium.

40g Box