The BioTek Marine Bio Series Media Reactors are designed from the highest quality extruded acrylic tubing available and they will complement our the BioTek Marine Bio series sumps but they can be used with any brand of sump. The BioTek Marine Media Reactors are available in 3 standard sizes that feature the Bio signature black and red design. The Bio Series media reactors can be used for carbon, GFO, PO4x4 and other types media filter media. The unique nozzle design is perfect for fluidizing PO4x4 media.