Our MEMSUB system is optimized for use of membrane filtration at low energy input. High-performance membranes, operationally reliable design and optimal airflow along the membrane surface guarantees a high degree of performance and long service life. Through the formation of module towers and intermittent ventilations, the specific energy use for the membrane filtration is significantly reduced. A back washing of the tubular membranes is possible with the MEMSUB systems and thus guarantees simple cleaning methods combined with a high permeate capacity.