Ready to go right out of the box and requiring no priming, the innovative Whisper EX power filter introduces a host of cutting-edge features; bringing you the best in efficiency and convenience. With its patented "Timestrip" technology, hobbyists can keep a watchful eye on the condition of their carbon filter and accurately determine when it needs replacing. This will help ensure optimal water quality for all your aquarium's inhabitants. The EX's newly designed filter carrier holds the filter and the drips, so you don't have to. After discarding the old filter and inserting a new one, the carrier drops easily back into place, eliminating messy and complicated media changes. Unlike other filters, the Whisper EX contains multiple layers of progressively denser floss to remove even the smallest particles. The carbon inside eliminates odors, discoloration, and harmful toxins. Finally, the "Bioscrubber" removes ammonia and nitrites that are deadly to your fish. This filter is rated for aquariums up to 45 gallons in size, and has a flow rate of 240 GPH.8" x 4.5" x 7.5"