The Nepall Fluidized Bed Water NLH-300 is a specialized aquarium filter system measuring 18.9 cm in length. It features a transparent cylinder design with black end caps and suction cup mounts for secure installation. Key features: • Fluidized bed filtration system • 18.9 cm length • Transparent cylinder design • Suction cup mounting system • Durable plastic construction This fluidized bed filter uses water flow to suspend filter media for optimal biological filtration in aquarium systems. The transparent housing allows easy monitoring of the filter media. The unit can be mounted horizontally using the included suction cups for secure placement.