Replacement Ceramic Bio Media for the Blagdon Inpond All-In-One 1400 (Pack of four) 1 kg of replacement Ceramic Biological Media in total The media is ideal for all small multi chamber filters, trickle filters, box and pressure filter systems. It comes in a pack of four pre-bagged packs in fine mesh filter bags Size: Length - 14mm Width - 14mm The Blagdon professional ceramic biological media has been specifically designed to provide a chemically inert, high surface area media with extreme porosity. This makes it an excellent biological media for pond filtration systems. For larger systems the 25 Litre box is better value and the media is larger