Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good solid operation

I don't have experience with other water cleaners to compare this one to. But it works as advertized.I always floss first, so I don't see how much cleaning can be accomplished, but this kind of product is best used for cleaning under the gums and messaging them. Often an overlooked chore.My only criticism is that the water reservior is too small. At the highest setting, a full tank will be depleted in maybe a couple of minutes approx. You need to be near a sink to refill it.I recommend that waterpic provide information on length of time a full tank will deplete, and also whether or not adding some hydrogen peroxide and salt to the water would damage the pumping mechanism.