The BioTek Marine Tek Series Pellet Driver Reactors are advanced filtration devices designed for saltwater reef aquariums to enhance water quality by housing and circulating NP Biopellets and All-In-One Biopellet media. These reactors come in three sizes, ensuring that you can find the perfect fit for your aquarium setup regardless of whether it's a small nano tank or larger display system. Crafted from high-quality cell cast acrylic translucent blue tubing with double welded seams, these reactors are made to last and feature right angle hose barb fittings, laser-engraved logos, and an elegant design that complements any aquarium interior.