- Pack of 6 Penn-Plax CCF231 replacement pads for Cascade 700 and 1000 aquarium filters - Made of Bio-Floss polyester, they provide essential mechanical filtration by trapping particles and debris - Improve water clarity and reduce bad odors in both freshwater and saltwater aquariums - Easy to install, no cutting or adjustments required, fit directly into the filter trays - Extend the lifespan of carbon and biological filter media - Promote the colonization of beneficial bacteria, helping to regulate ammonia, nitrite, and nitrate levels - Prevent clogging of other filter media, optimizing system performance - White color, standard size compatible with Cascade 700 and 1000 filters