Measuring 82 feet x 4.45 inches, this replacement filter fleece roll is tailor-made to fit the 500 filtration system seamlessly. No modifications required—enjoy a hassle-free replacement process that saves you time and ensures a snug. High-Efficiency Filtration for Crystal-Clear Water Crafted from premium non-woven polyester, this filter media pad boasts exceptional debris-trapping capabilities. It effectively captures fine particles, impurities, and organic waste, preventing cloudiness and maintaining optimal water quality for coral tanks and marine aquariums. The high-flow design promotes maximum water circulation while resisting clogs, ensuring your filtration system operates at peak efficiency. Durable & Tear-Resistant Construction Made from high-density non-woven polyester fleece, this filter roll offers outstanding durability and tear resistance. Built for long-lasting use, it provides reliable filtration even in high-demand environments, reducing the frequency of replacements and delivering consistent value for your investment. Automated Advancement for Hassle-Free Maintenance Equipped with an integrated automated advancement system, this filter roll minimizes manual intervention. It automatically advances fresh fleece as needed, extending replacement intervals and ensuring uninterrupted filtration performance. Spend less time on tank upkeep and more time enjoying your aquatic hobby. Tool-Free & Quick Installation Install or replace this filter roll in just 5 minutes—no tools required. It's ready to use right out of the box and connects directly to compatible systems, making it ideal for both beginner and experienced aquarium keepers. Please confirm your filtration system model before purchase to ensure compatibility. For optimal results, follow the recommended replacement schedule based on your tank size and bioload.