The base is very light so the base is being push up by the water pressure. I found it whirl much better moving it from right to left or left to right than forward or backwards. It cleaned very quickly and well once I got the hang of it. It will save me hours of time in the spring when I get busy cleaning deck and drive way.
Purchased this brush to clean my decking and it made the job so much easier. I did a portion of my large deck with just the pressure nozzle - it did a great job but was pretty tedious. The brush made the job fast and easy.