Overview Optimised forPerformance BioReact is an in-sump Bio Reactor, designed for hobbyists. It helps to accelerate the growth of beneficial bacteria, and helps to ensure water clarity. It is ideal to control the Phosphate (PO4) and Nitrate (NO3) level. Powered by our very own and reliable Aquatrance, which is both energy efficient and quiet, the BioReact is easy to set-up and allows you full flow control to the media. With a space saving footprint, it allows you more space within the sump for more products. Made from a high quality cast acrylic body, it has a specially designed water inlet bottom chamber which prevents the media from entering the pump during a power off. A rigid sieve plate at the top cover acts to prevent the pellets from escaping through the outlet connection. Due to the unique design of having no pipe in the middle of the chamber, it is easy to replace the cover after refilling the pellet media. The 4-direction cover also makes it easy for you to orientate the BioReact accordingly to your set-up. For best results, it is highly recommended to use our Bio Spheres media. Bio-Spheres are specifically encapsulated pellets with a 100% pure biological polymer solid carbon. These pellets when use with our Bio -Churn Reactor, will slowly release the polymer carbon within the marine water which will encourage the growth of beneficial bacteria and enzymes on the pellets surface. Bio-Spheres provides a food source required for beneficial bacteria to reproduce and reduce nitrates and phosphates. Available in 500ml or 1000ml bag. Holds 2 liters of BioSphere media.