The Spec and Evo Foam Filter Block provides effective mechanical filtration by trapping large particles and debris. The foam filter block is suitable for Fluval Evo 13.5 US Gal. (52 L) aquarium (10531), and the Fluval Spec 16 US Gal. (60 L) aquarium (10525). For more fish tank accessories, check out other Fluval products including aquarium filters, filter media, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval first broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a landmark breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.