The Aquascape Low Density Rigid Filter Media Mat offers effective mechanical and biological filtration for ponds of all sizes. Measuring 24" x 39" x 1.5", this versatile filter media can be effortlessly trimmed to fit your specific requirements using a serrated knife. Its adaptable nature allows for seamless installation in various skimmer boxes and filters, catering to diverse pond setups. Aquascape's Filter Media Mats are not only durable but also remarkably low maintenance, requiring only periodic cleaning to remain efficient. To optimize filtration performance, we recommend combining different densities of media for enhanced mechanical and biological filtration capabilities. With Aquascape, achieving clear and healthy pond water has never been easier.