Abstract: A method of increasing the production or efficiency of a process in which a fluid is passed through a matrix the efficiency of which decreases with use in which the matrix is initially filled at a high rate, and an initial flow rate on the order of not more than three times the final flow rate is employed and subsequently decreased to a final flow rate which is lower than the constant flow rate which would be employed in such a process over a period of time such that the integration of the flow rate with respect to time yields a volume of product greater than or equal to the volume produced at a constant flow rate for such product. The above integrated feed program is described specifically as employed in magnetic separations.