Please Note: Due to global supply shortages, Bashsea is temporarily manufacturing this product without the gate valve until shortages are addressed. This does not affect performance as we have implemented a factory pre-set water level. We apologize for any inconvenience this may cause. The Bashsea Bio-Reactor was designed to be the ultimate biological filter. Bashsea is the first company to manufacture a biological filter utilizing Moving Bed Technology for the marine aquarium. The Bashsea Bio Media provides the maximum active surface area for the bacteria to colonize, more than other types of static media. It is this process that removes harmful ammonia and nitrite from the water. As the Bio-Media moves within the filter, it causes old dead bacteria on the surface to be removed. This makes space for new heavier feeding bacteria to rapidly colonize. Within the media is a protected surface which allow bacteria to follow their natural life cycle driving the latter stages of the nitrification cycle. 100% self cleaning bio media- ZERO MAINTENANCE REQUIRED Bashsea engineered water injection plate provides perfect Bio-Motion Rubber Membrane Air Diffuser will never clog or need to be replaced Precision CNC Key Hole Flanges True O-Ring Seals Included gate valve for precise water level control Designed and hand built in the U.S.A. using 100% American Made Acrylic Construction Available sizes - 8-18", 8-24", 8-30", 10-24", 10-30", 12-24", 12-30" All Bio-Reactors are fully customizable in any size and configuration to meet your specific requirements. Specifications: Model 6-18 6-24 6-30 8-18 8-24 8-30 Dimensions 12.25" x 7.25" x 18" 12.25" x 7.25" x 24" 12.25" x 7.25" x 30" 14.25" x 9" x 18" 14.25" x 9" x 24" 14.25" x 9" x 30" Base Dims 7.25" x 12.25" 7.25" x 12.25" 7.25" x 12.25" 9" x 14.25" 9" x 14.25" 9" x 14.25" Chamber Diameter 6" 6" 6" 8" 8" 8" Water Input 0.5" 0.5" 0.5" 0.75" 0.75" 0.75" Air Input (hose barb) 0.125" 0.125" 0.125" 0.125" 0.125" 0.125" Drain 1" 1" 1" 1" 1" 1" Flow Rate Min-MaX 150-250gph 250-350gph 300-400gph 300-400gph 400-550gph 500-700gph Aquarium Rating 50-75gal 75-150gal 125-200gal 150-225gal 200-300gal 350-550gal Air pump Water Pump Recommendation Sicce 1.5 or equiv Sicce 2.0 or equiv Sicce 2.0 or equiv Sicce 2.0 or equiv Sicce 2.0 or equiv Sicce 2.0/3.0 or equiv