Abstract: Filter cake is shaken off a candle or other similar filter by impact action. Sullied solution is passed in cross flow through a vertical disposed tube of a filter element, such as a tubular screen, positioned in a lower filter chamber and into a central axial exit tube which extends through an apertured horizontal partition forming the bottom of an upper filter chamber. An outlet housing surrounds and is fixed with respect to the exit tube in the upper chamber. One or more belleville or coil springs are positioned between the outlet housing and the partition. An impact force is applied against the top of the outlet housing to drive the outlet housing, exit tube, and candle filter so that the assembly impacts downwardly against and compresses the belleville or coil springs. The stored energy returns the housing, tube and filter upward to a reimpaction position.