Aqua One Parts Bio Prism for Ecostyle 81 Pack of 60

A Pack of sixty Bio Prism filter media especially chosen by us to fit the Ecostyle 81 trickle filter and help to provide much improved biological filtration. Each Bio Prism is cylindrical and has a massive surface area for helpful filtration bacteria to grow on. These lie easily on top of the 108c carbon cartridges and are very light and easy to remove at filter clean out time. The Bio Prisms are made from plastic and will last for the life of your filter (unless you lose some!) . Cheap and very effective, enables your aquarium to hold more stock once mature and bio active (usually after 4-5 weeks)