Best Value Vacs Mercurius Active Closed Loop Extractor10 lb Mercurius Active Closed Loop Extractor The Mercurius system is a rack mounted MK V that is specifically built to be run actively. Bi directional solvent input prevents channeling and ensures a full yield is achieved. The Mercurius system also features a CMEP OL recovery kit standard. The CMEP OL has a coil bypass built onto the output to re loop hot vapors back to the top of the material column. This is used to pressurize the material column