FilStar Microfilter Pads are the fifth and final stage in the
mechanical filtration of the aquarium water with the Rena Filstar
external canister filter. These will remove the smallest of particulate
matter and are used to "polish' the water for that clean and clear
aquarium "look" that we all want to see. These are the factory original
replacements for use in the FilStar XP1, XP2 and XP3. This is
bulk-packed 8 ea per box.