Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: why does it leak
Document: we bought @ cosco for like $50 and thought it was such a steal (so we got 2) after 3 mos. it began to leak and the one my bf bought because of my rave also leaked too! i'm gonna try a tabletop one next.
In the past, I have been very disappointed with humidifiers. Either they leak or don't seem to do much of anything. However, this Holmes U Tower humidifier is sleek in design and has a few nice features such as:- The two filters are easily accessible at the base of the unit.- The tank is easy to handle, fill, and not too heavy to carry.
Still, the thing did what it was meant to do--humidified the room--until after three weeks the full tank leaked all over the wood floor and area rug. We thought the top must not have been screwed on correctly, but it happened again, warping the wood floor. Leaving the full tank in the bathtub, it didn't leak at all, which made us think that something had gone wrong with the base.I didn't waste my time trying to get this thing fixed. I returned it.
with forced hot air for a heating system, this is a must for the home. That is why i bought 2 . one is for each floor.
this is the best humidifier ever is very quiet and easy to add water. Would recommend to friends works grate
the electronics have FAILED ALREADY. This is the second humidifier like this we have purchased. it has been disappointing. Will not purchase again
so far I love it..  very quiet operation, and it does a fantastic job of raising the humidity in my apartment.
cheap motor and fan design. its quiet, then noisey, then loud, and so on.... obviously it was never product tested because they would have caught this flaw.
[UPDATE 1/20/14] After only a couple of weeks I dropped the awkwardly shaped tank while trying to fill it and it shattered. Now I have an almost brand new unit with no capability to hold water. VERY frustrating.=================Like just about every humidifier on the market, this humidifier needs a bigger tank.
You will probably just end up overhumidifying your air and having to refill the tank constantly.Bought mine at Costco for a pretty good price, but given the problems
Answer: Well first check to see that the cap is on tite and the tank is not cracked. If air can get in to the tank anywhere other that thru the check-valve in the bottom of the tank when its upside down, water will overfill the tray on the bottom. I had a cracked tank and there was just enough gap in that crack that air got in. Guess where the water wanted to go? Yep, on the floor. In my case on the carpet. I would bet even money that's the problem. It can be super glued but the glue must get in the crack or it may not seal. If that doesn't do the trick a new tank is about $11.00 on Amazon or ebay. I forgot to say fill the tank and hold it uprite and upside down  to find a leak. Hope this helps. Merry Christmas.