This variant of the AnMBR combines the previous two variants, keeping the membrane unit external, but submerged within an external chamber. The anaerobic process takes place first, and then subsequently enters the membrane unit for filtration. Here, the influent(wastewater) is pumped into the externally submerged chamber where it is then filtered into the permeate(effluent) and the retentate(organic load). This variant, similar to the submerged AnMBR, also utilizes low negative pressure to separate the permeate and retentate. Following this process, the effluent leaves the system while the organic load recirculates into the bioreactor unit to then turn into biogas.