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This is kind of like you get what you pay for. If you have an extra couple hundred bucks to spend on a better quality one it is worth it. When I first started using it, I noticed a smell. I contacted the company because I know it is bad to breathe in any ozone and was under the impression that it was safe to put on your counter while running.
The company said that it is normal to have a smell since water doesn't absorb all of the ozone and that it should be in another room while running. I feel like it's kind of false advertising in that sense because the way it is marketed here seems like you can just conveniently wash your vegetables in your kitchen with it while doing other things. So no, you really can't, it has to be in another room which is kind of annoying. Then you have to air out that room from any smells before going into it.
I do feel a difference in drinking the water but I am going to do more research and get a better quality one. This also pretty much is the lowest amount of ozone you could have, so getting a better quality one means you are getting more ozone in your water which will be more beneficial to your health.
I really liked this product while it worked. I used this product maybe 2-3 times a week on average. After 6 months it would stop in the middle of a cycle and just flash the display. I consulted the owners manual and tried to consult the website with no success on fixing the issue. I put it away for a few weeks, took it out today to try it it worked for about 4 minutes the pump stopped and it started to smell like it was on fire. I wouldn't recommend this product, I am sure another company makes a more reliable unit. It helped me decide it this kind of device was right for my use. I will certainly purchase another more reliable unit from another manufacturer. This unit would have been a 4 star if it had a longer life. Maybe I got a faulty unit, maybe my idea of lite use is this company's idea of heavy use I am not sure. I can say the unit never got wet, never got dropped or abused it just failed.