Abstract: There is provided a method and apparatus for supplying pulsed fluids to pressure vessels which comprises: at least one reservoir for the fluid to be pulsed; valved conduits connecting the reservoir to a pump; a conduit with control valves from the pump to one or more ballast tanks with the control valves able to sequentially or intermittantly direct a flow of fluid into each of the ballast tanks; conduits from each of the ballast tanks to a control valve and injection valve which injects fluid from the conduits from each of the ballast tanks into a high pressure processing vessel where materials to be contacted with the pulsed fluid are contacted with the fluid. For recycling the processing fluid, a conduit from the high pressure processing vessel can be connected to a separator vessel, secondary processing vessel or storage vessel.