After 3 weeks of use it did not work. Once this model stops spraying water and cleaning the inside of my mouth, I have to take the reservoir out then reposition it back in. This just started this week. I had previously owned the same model for over 8 years and never had a problem with spraying water into my mouth when both the machine and spraying handle turned on the on position.
I recently had to replace my water pick after 16 years. I am very confident of the product quality that I purchased the exact same model. This water pik has helped me keep my gums and teeth in excellent shape . I am very pleased with the product and would highly recommend one.