OxyTube is basically a mini MABR module containing the heart of the OxyMem technology within an the outer stainless steel protective layer. This module is fed with air, or enriched air, to ensure oxygen reaches the biofilm when required i.e. once a biofilm has been established. No off-gas or air feedback controls are usually deployed with OxyTube..
Its purpose is primarily for hands-on experience, not an analytical treatment of the wastewater.