I thought I would give another brand's surface cleaner another try. Previous ones broke within hours of using them. I used the 15 inch Westinghouse for several hours and everything is still operational. Tip is to go slow and overlap your rows. Worked well on exposed aggregate.
Normally used a standard pressure washing tip to clean a 30-foot aggregate walkway and stoop. It would take quite a while and a good deal of water. The Westinghouse 12 inch surface cleaner easily cut the time in half and appeared to use much less water for the entire job. My 1600 psi electric pressure washer had no problems with the attachment. Should have bought this several years ago.