Check the listing for details. AQUANEAT® Replacement Canister Filter Pads Compatible to Cascade 700/1000 Sponge. Condition: New. Listed at 16.99 USD. Features: Generic pads for Cascade 700/1000 CCF2UL CCF3UL replacement canister filter sponges. 4x sponge bio filter pads (1xCoarse, 2xMedium, 1xFine): Bio sponge optimizes the colonization of beneficial aerobic bacteria keeping the aquarium healthy. (Reusable after rinsed) 12 pcs of white floss pads: Filter out fine particles providing crystal clear water. Provide both mechanical and biological filtration. Includes: 1xcoarse (Blue), 2x medium (Green), 1xfine (Black) + 12 floss filter pads (White) These filter pads are not the original products but of high quality. INCLUDES: 1xcoarse (Blue) 2x medium (Green) 1xfine (Black) 12xfloss filter pads (White) Tips for Usage and Maintenance: · Maintenance of Sponges: The sponge will need to be rinsed every time it becomes dirty, about once every 1 to 4 weeks. It’s helpful to reserve the beneficial bacteria by washing the sponge gently with water from the fish tank instead of tap water. After 6 to 12 months’ usage, the micro holes of sponge are gradually clogged by the tiny debris. So it is also recommended to replace the sponge once 6 to 12 months or when the sponge gets worn out.