Size: 143x95x525mm Boyu Fluidized Bed Filter is an extremely efficient, high capacity "biological" filter. This could also be use as a fluidized reactor for your PO4 remover/carbon. A reactor is a much better way to use your PO4 remover/carbon than a canister filter or a sack in your sump. This is because of the enormously high surface area the reactor can produce. Comes with sand media and a pump. *If it is going to be use as fluidized reactor PO4 remover/carbon is not included