No air bubbles. Followed the troubleshooting suggestions and after charging and soaking the water in the cup for 8 hours according to the included instructions, there was still no bubbles. Searched the internet for other solutions and discovered that the mug has a hydrogen generator that not only adds hydrogen to your water but also ozone and chlorine. It is not safe to drink water from it. You can buy chlorine and ozone test strips from Revain to see for yourself. Return the item now.
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