Rochem-FM modules with ultrafiltration membranes have been develope especially for the separation of bacteria, viruses and fine solids from water anf wastewater with the high fouling potential. Ultrafilration is based on porous membranes. Particles larger than the pore size of membranes are rejected. In practice even smaller particles are rejected because of the selectivity of the filter cake (gel layer) on the membrane surface. Therefore ultrafiltration membranes form an absolute barrier for bacteria and viruses includung colloids and macromolecules.

Rochem-FM modules exhibit very low specific energy consumption at high and steady state fluxes. Unique is the possibility of an optimal adaption of the feed path space (distance between membrane cushions) for the individual case. This feature allows for applications in a wide range of solid concentration.