I use it at the highest intensity and the power is satisfactory. The tank is enough for one use, or sometimes I may need to refill it a little, which is easy with the hole it has at the back. It cleans easily as it unscrews. I use it at night after brushing, and what I noticed is that in the morning I wake up without any trace of bad breath. I will come back after a month of use... The reason I chose this product is that I found excellent reviews relative to its price. Important: I don't leave it with water inside overnight, I empty it and let it dry to avoid mold. The nozzle rotates to be used on the inner teeth as well, I would prefer it to "lock" somehow because sometimes it rotates on its own without wanting it, but okay, once you learn how to use it, it becomes easy to use.