Abstract: An apparatus for testing the ability of a filter to filter contaminants, by automatically controlling and/or monitoring various parameters, including the following, among others: the flow of fluid through a test filter; the rate of injection of contaminants upstream of the test filter; the variation in the flow of fluid through the test filter; contaminant particle count upstream and downstream of the test filter; vibration of the test filter; temperature of the fluid flowing through the test filter; and the pressure drop across the test filter.