I have used this diffuser sparingly since purchasing it in 2017. The first few times I used it, it produced a lovely amount of mist, and all the water diffused out. Then suddenly, it would turn off before all the water had diffused out, leaving a centimetre or so in the reservoir. There is significantly less mist coming from the diffuser too. Frustrating. I wipe my diffusers out after each use with rubbing alcohol, and have never used anything but saje blends in them. I don't fill past the line either. Not sure what the issue is, but for that reason alone, I wouldn't repurchase.