The Bubble Magus ARF-M filter eliminates the need for filter socks. Water is fed into the internal chamber via the aquarium overflow drain, and through the filter roll. As the filter begins to clog the water level rises in the filter chamber triggering the built-in water level switch to advance the filter roll, exposing new clean media until the water level drops. This cycle repeats every time the media begins to clog, thus preventing the release of organic compounds into the aquarium water.
