Answer
Sep 14, 2021 - 12:20 PM
This will always depend on the application. For stubborn, hard-to-remove dirt, a pressure washer's PSI is more important. For large amounts of dirt, a pressure washer's GPM is more important. When given the choice, you should always lean towards more GPM (flow) over PSI (pressure). You can move closer to what you are cleaning to increase pressure, but there is no way to increase flow. However, with more PSI comes a greater chance of damaging what you are cleaning.
