A U.S. Patent for “Particle Separation and/or Purification of a Fluid” was awarded to Sartorius on October 6th, 2020.The present invention is a filter system with a first set of filter modules and a second set of filter modules that is different from the first set of filter modules. Each set of filter modules includes an inflow channel and an outflow channel. A fluid inlet is connected to the first set of filter modules, a fluid outlet is connected to the second set of filter modules, and a separation interface separates the first and second sets of filter modules. The separation interface has a first interface channel. Learn More