execute however strain is placed on the fracturing pumps while performing this kind of rapid pump rate change in a preferred embodiment of this invention rather than rapidly increasing and or decreasing the pump rate of the fracturing pumps or in addition to changing the pump rate a portion of the fracturing fluid with or without proppant is diverted away from the wellhead changing the flow rate in order to provide a pressure pulse to the wellbore 10 fig4 shows a schematic representation of an embodiment of an overall system layout 30 of this invention for providing a pressure pulse to the wellbore 10 with or without changing the pump rate the system 30 of this embodiment preferably includes a fracturing tank 32 generally a water tank to store the water and or other fluid that will comprise a portion of the fracturing fluid the system 30 preferably also includes a pre blender 34 preferably a mixing truck that mixes the water or other fluid from the fracturing tank with other components of the fracturing fluid such as polymers and other chemicals to make the fracturing fluid at this point the fracturing fluid preferably does not include a proppant the system of this invention further includes a slurry blender 36 that mixes the fracturing fluid with the proppant and or other chemicals to create a.