I was very excited to receive my Cspring, hooked it up but the water tank leaked air. They provide you a modified water tank with input water hose and two sensor clamps. I emailed Cspring and they reponded ... like within 15 min of my email!! Replacement tank was sent quick and they gave me a return to send back the leaky tank. Plugged the new, new water tank and BAM! Sleeping like a charm ever since. Csprings consistantly keeps my humidifier water tank filled to at least the MIN line and I have yet to suck dry air since I bought it! A dream come true. Love the big 3-liter water tank it comes with. One thing to note, there is a light inside the white tank that glows "green" all night. The tank also has a night light feature you can tap on or off. But the green light inside the tank is always on (and visiable in a dark room). I sleep with my eyes closed and the light is very low, so not an issue. Ideally, I would suggest to Cspring to include a dark sleeve for folks that don't want the extra light, but that's a nit. Bottom line, LOVE IT!!