Check out our expert guide and you'll have a gleaming patio in no time. 1. Clogged nozzle A clogged nozzle is one of the most frequent causes of pressure loss. Dirt, debris, and mineral deposits ...

If the jets are still clogged, you might need to move up to more intensive measures: removing and cleaning the entire nozzle. If you're not comfortable with this, it might be time to visit a mechanic.