Canister filter media designed to fit the FilStar XP. For removal of finer debris. For removal of fine debris and solid wastes in aquarium filtration systems before they enter chemical and biological filtration chamber. Package of two. Two pads per box. 30 pores per inch. To filter out fine debris. Can be rinsed and re-used many times. Features include: Removes fine debris and solid wastes in aquarium filtration systems 30 pores per inch to filter out fine debris Can be rinsed and re-used many times 2 pads per box.