I have 1600 square-foot timber tech deck.Proper pressure wash job 5 to 6 hours.Typical clean with an automotive foamer and deck cleaner and push broom scrub and then hose off was 2 to 3 hours.This tool will cover three boards per pass.1. When not in direct sun, foam your deck with your favorite deck solution.2. Lean forward, press down, walk back-and-forth three boards at a time.3. RinseI can do the same 1600 square-foot in one hour or less. Most importantly, I’m not exhausted.I would say it comes out to almost as good or as good as pressure washing. And overuse of a pressure washer on a composite deck can lead to your deck getting dirty faster as it will rough up the boards.I recommend you buy the strap to take up some of the weight of the battery.This tool just gave me a lot of weekend back.