The element M Reactor is a filter media reactor that allows for the use of virtually any type of filter media in either fluidized or non-fluidized flow – including fine particle media such as resins. The element M Reactor allows for excellent efficient reaction with consistent even flow from the bottom of the reactor to the top. Using the adjustable internal plate, filter media can even be separated to allow for various uses within the same reactor. The element M Reactor features a by-pass valve which allows for fine flow regulation for even the most delicate media such as beaded resins.