ultrasonic mist maker

i've read some posts about this link because I got it from this forum but when I searched for any setups using it I got nothing. These are from mainlandmart.com and are less than 100 dollars and in my case I would only be doing 2-4 plants so I believe I would only need the lowest model with the buoy to hold it at the waterline. Leave it on constantly with the minimal amount of nutes for the amount of water used correct? then ventilation in the gro chamber and keeping temps in check. What else do I need to concern about? draining the water every week or what do you guys do for drainage if you are using a similar system. I plan on having a grow chamber about 3'x4'x5' and use mr nice clones and some other various ones I can pick up in the area. Tubberware+3"inch netpots+mistmaker anyone done this before? thanks

ok now I know I need a timer for the mister. do I need an extra water source and water pump to keep the levels up? Do I mix the nutes and the water in the secondary water source and let it be pumped into the grow bucket to be misted?

nevermind on this I might just go with a method of this guys setup:
http://www.hg420.com/showthread.php?t=238

So I would need a water pump and a humidifier float? would this setup need a timer