The water container on this water flosser is substandard. It began leaking from the bottom after only a few months of use (approximately once a week). It was a waste of money, and I believe it's always better to buy a well-known brand rather than giving an opportunity to a new one.
I contacted MySmile about the issue, and they sent two replacement containers, but neither of them fit. It seems there is no quality control or standardization. It appears MySmile is just a seller, not the manufacturer. Ultimately, it was a waste of time and money to buy this product and then try to get a warranty replacement.