Details Designed with a sleek, black appearance. The “Xtender” button uses a bypass to skip over the fine filter pad—should it become blocked—to reduce the need for additional cleanings. Delivers an adjustable flow rate of up to 250-gallons per hour using only 12-watts. Employs 2 individual filter baskets for mechanical, biological and chemical media within an easy-to-clean grid system. Comes complete with additional installation equipment and a detailed manual for easy setup. The EHEIM Pro 4+ 250 Aquarium Canister Filter is a great way to keep your finned friend’s water column crisp and clean! It features virtually silent operation with powerful performance that’s optimized for energy efficiency, delivering an adjustable flow rate of up to 250-gallons per hour using only 12-watts. Equipped with a self-priming aid, top prefilter and locking safety hose adapters, it is engineered to be an easy and convenient way to keep your underwater companions comfy. The “Xtender” button is also a helpful addition that uses a bypass to skip over the fine filter pad—should it become blocked—to reduce the need for additional cleanings. Suitable for both freshwater and saltwater aquariums, this sleek, black unit employs two individual filter baskets to keep tanks ranging from 32-gallons to 66-gallons looking their best