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Filtration is essential for most engines, and pressure and power washers are not exempted. The gas engines on these washers require air filter swap-outs. The filters protect the pump from foreign contaminants present in the water. The water filters also extend the useful life of the power or pressure washers. It is clear that power and pressure washer water filters are vital to your machine functioning properly. Rinsing the water filter can help clear the debris and get the pressure washer operating at its peak performance. If your washer is operating at a low pressure over time, you might have to consider replacing the water filter.