Best Backflow Preventer Installation in Irvine CA

I had a pipe that goes to fire sprinkler system punched by a screws from previous tenant of the house, also the valve in the riser box got broken when I tried to drain the water out after turning off our main water switch. Anthony came the next day and fix everything. He is very professional and courteous, did a good job to repair both issues around 3 hours. He also provide good advices on the maintenance of the system!! Will definitely recommend his service to anyone that needs repair their fire sprinkler system.

I usually don't post reviews on Yelp but I'm making an exception for One Flow Back Flow. If anyone needs their backflow prevention device tested, serviced or replaced; I would recommend One Flow Back Flow highly. I own a retail water store and testing of our backflow prevention device is required annually. I had tried to use the gentleman who had tested my device in previous years but after numerous emails and phone calls failed to get results and with one week left before the deadline to submitted test results, I turned to John at One Flow. A live person, I think John's wife, answered the call. She suggested sending photos of the backflow device and stated that John would give me a quote by the end of the day.  This was Monday. By 2PM, I had a quote. There were a couple of email exchanges to which John responded promptly to clarify a couple questions.  By 4:00 we had scheduled an appointment for 10AM Wednesday.  John showed up at the scheduled time. He and his technician had the backflow prevention device replaced and tested by 1PM.  

Unlike the gentleman that I had been using who said he has been in the business over 25 years, I was very impressed by John's  prompt response to the phone and emails, the adherence to promised times and quality of work.  You don't often experience this level of professionalism these days. I will use John and One Flow Back Flow for my backflow prevention device testing and service from here on out.