John L.
Get real people.
I've been using this for a few years and it works great for CLEANING OUT my sinuses. It is NOT a cure. If the mucus returns (stuffy nose) soon after use it is because you have a serious sinus problem. Possibly an infection. I had the same problem. It can't fix the sinus problem. Just gets out the nasty stuff that can become a dark green if not rinsed out. If your unit stops working, it may be because you cleaned it wrong and got water into the battery compartment. Simply pull the batts. clean and dry it completely. You may have to use rice. Or maybe you don't have the top part 'locked in' properly. The only reason why mine would work is for these reasons or maybe bad batts. Give it a chance. I just delt with the batt issue. Everything is dried out and it works great. Good luck.