Replacement ceramic bio media for the blagdon inpond all in one 1400 pack of fourr 1 kg of replacement ceramic biological media in totalr the media is ideal for all small multi chamber filters trickle filters box and pressure filter systemsr it comes in a pack of four pre bagged packs in fine mesh filter bagsr sizer r length 14mmr width 14mmr r the blagdon professional ceramic biological media has been specifically designed to provide a chemically inert high surface area media with ex