The Signature Series BioFalls Filter 2500 Mat is the perfect choice for any pond. This 18" x 22" x 2" filter mat includes one sheet, ideal for trapping and removing small particulates from the water. Enjoy a clog-free pond with this easy-to-clean filter mat. Encourage healthier pond ecosystems with the Signature Series BioFalls Filter 2500 Mat. By effectively capturing and removing small particles from the water, this 18" x 22" x 2" filter mat helps maintain crystal clear water. Say goodbye to clogs and hello to a low-maintenance pond experience.