Sera Crystal Clear Professional is an advanced, high-performance filter medium designed for superior mechanical filtration in both marine and freshwater aquariums. Its innovative and patented 3D fiber structure works rapidly to remove even the smallest suspended particles greater than 10 µm, effectively polishing the water by capturing troublesome floating algae, detritus, and sludge. This process ensures your aquarium water remains exceptionally clear, enhancing the visual appeal of your reef tank and the health of its inhabitants. Unlike traditional filter wool or floss that can compress and lose effectiveness over time, these unique filter balls are engineered to maintain their shape for consistent performance. A key benefit is their reusability; the balls can be washed out multiple times and retain up to 80% of their effectiveness, making them a more economical and environmentally friendly choice. This durable medium is compatible with all filter types, offering versatile application for any aquarium setup. This product is ideal for the discerning aquarist seeking pristine water clarity and a low-maintenance, long-lasting filtration solution. Hobbyists tired of constantly replacing disposable filter floss will appreciate the wash-and-reuse capability of Sera Crystal Clear Professional. For a comprehensive filtration strategy, it serves as the perfect mechanical stage when used in conjunction with a high-quality biological filter medium to create a stable and healthy aquatic environment.