Mobius RDS II Removeable Downstem CyclerMuch like its older brother, the RDS, the RDS II is one of the most awesome functioning pieces of the Mobius line, but in a smaller compact size. The vapor or smoke diffuses through the removable matrix downstream first and then travels with the water up into the in cycler where it then separates from the water and is inhaled. The water spins around and drains down very slowly due to the curvature of the recycling tube. All Mobius products come with a