The Klir V2 Fleece Roller Filter DI-4-V2 is an innovative solution designed to replace traditional filter socks in saltwater aquarium setups, offering automatic filtration with minimal maintenance. This advanced system features a drop-in design that fits directly into four-inch filter sock chambers, automatically unrolling new fleece material as it becomes clogged. The Klir V2 includes a smart controller and magnet-mount sensor to monitor water flow and ensure continuous clean filtration without the need for daily changes. It comes with 25 yards of 50-micron fleece, an activated carbon insert, and a DC geared motor for efficient operation.