Keep your aquarium water crystal clear with these replacement filter accessories designed specifically for the WP-290F filter system. This pack includes 4 pieces of high-quality filter material that efficiently traps debris, waste particles, and other impurities from your tank water. The filter material is easy to install and fits perfectly in your WP-290F filter unit. Regular replacement of these filter materials helps ensure consistent water quality and promotes a healthier environment for your fish. For best results, replace these filter materials according to your tank's maintenance schedule, typically every 4-6 weeks depending on your aquarium's bio-load and water conditions.