We had water hammer problem in our piping and contacted WaterWorks Plumbing to fix the problem. The plumber arrived on time, and tried his best to fix the problem. When the noise continued the next day, I contacted WaterWorks again and the same plumber came back. He took the arrestors off the pipes and refunded us back all of our money minus the $75 for the consultation. Although we were disappointed that the problem couldn't be solved, we knew that through his experience, we couldn't fix the problem without opening up our ceiling. We choose to have a contractor assist us with that. We appreciated having our money refunded. I would definitely use WaterWorks again.