The GPM means the gallons for each minute or the of normal water flowing for the pressure appliance. You will have to know what the GPM of your water source into the tank is and it has got to meet the minimum requirements for your specific pressure washer. You need to have a steady and constant source of water flow into your pressure washer so you don't damage the pump. Healthy house is supplied with municipal water, you will likely have around 9 or 10 GPM being subtracted from your typical inch diameter garden garden.
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