I read the directions, assembled the unit, re-read the directions over a couple of days and set up the unit for use. I was very impressed with the way it cleaned up my carpet. I have 2 indoor cats who make regular deposits of hair balls, the air system brings in vehicle pollutants that manage to get in under the door and I get some vehicle oil and grease from the parking areas on my shoe bottoms. I used a stronger mix of carpet soap in a spray bottle on the worst spots and everything came very clean. I am extremely happy with my Hoover SteamVac Carpet Cleaner with Clean Surge, F5914900, purchased on Amazon. It was delivered in a timely fashion, again I was impressed. I have since lent the carpet cleaner to a friend to do his mother's place and she was impressed with how clean the carpet was, from her that's something. I am very happy with my purchase!