Advanced - AR Blue Clean AR635 Portable SolutionAR Blue Clean AR635 HOT builds directly on what made the 630 so good, but with a meaningful jump in performance. If you liked the 630 but wanted more flow and a little more pressure, this is that machine. In testing, the 635 delivers a real step up with a working output of around 1000 PSI at 3. 1 GPM using our accessories. That additional flow is noticeable, especially for rinsing and foam cannon performance, and it puts this unit firmly above most