Premium Ceramic Filter Rings 2kg of premium quality Ceramic Filter Rings with 2 x White Media Bag included. Our filter rings are an ideal biological filter media for use in Aquarium and Pond Filters. These filter rings include a white mesh filter bag - allowing easy cleaning when inside your filter. Alternatively, these can be taken out of the media bag and placed loose in the filter. The huge surface area of these filter rings allow beneficial bacteria to colonise, and biologically filter your aquarium water - removing ammonia and nitrite. Stock held in our UK warehouse for immediate dispatch.