The nine-stage Biostone Plus incorporates the amazing natural properties of “vortex hydraulics” in its filter body design which reduce channeling and ensure the optimal performance and longevity of your filter. Its superior cutting edge filtration media is a uniquely treated type of “super” carbon. This is not your standard old school GAC. This is media designed for ultimate chlorine and chloramines filtration. Also, a special heavy metal reduction media reduces lead, aluminum, copper and other heavy metals. The addition of Bioceramic Tourmaline reduces surface tension in the water and aids in the ionization process. Multiple sediment filters between the various stages remove the suspended solids of one micron or greater.