Keep your aquarium water crystal clear with these high-quality foam filter pads designed specifically for Fluval FX4, FX5, and FX6 canister filters. This pack of 6 replacement bio sponge foam filter pads ensures you'll have a steady supply for regular maintenance. The pads provide excellent mechanical and biological filtration by trapping debris while creating an ideal surface for beneficial bacteria to colonize. These replacement filter pads are precisely sized to fit your Fluval canister filter, making maintenance quick and simple. Regular replacement of these filter pads helps maintain optimal water conditions for your aquatic pets. The dense foam construction effectively captures fine particles while maintaining strong water flow through your filtration system. Perfect for both freshwater and saltwater aquarium setups, these filter pads help you maintain a healthy aquatic environment.