Ceramic Rings provide ideal surface area for beneficial bacteria colonization. Pure Aquatic Ceramic Rings are highly porous and hollow to effectively distribute oxygenated water and create additional surface area. Colonies of nitrifying bacteria grow on the outside of these rings, removing toxic ammonia and nitrites.
Works great, It is in the middle tray of my xp3 api canister filter on my 120 gallon 48x24x24 aquarium(the middle tray houseas the best bio m,edia and I have sponges, scrubies and pads in the other baskets). It is with some pre fiilter media and ehiem course gravel... My aquarium is clean and it does it's job...
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