I have not yet used the foggers but plan to, here is a thread that has some discussion about foggers:
http://www.hydroponicsonline.com/for....html#post3676
Here is a video that was posted in that thread on building your own fogger:
YouTube video
ultrasonic foggers or
mist makers are what to look for when searching to buy these. If you don't feel like building your own I think the foggers that are sold with Halloween supply's will work. Someone mentioned getting the ones that are Teflon lined or they may clog. I have read that you can clean them with a Q-tip and vinegar to clean the salts off (vinegar cleans the salts off
grow rocks), and here are a few places that sell replacement discs:
Mist Makers
Replacement ceramic disk for ultrasonic water fogger
Here is a link to a company that makes them for hydroponics:
NUTRAMIST FOGGERS
The company does not sell them on the website, they sell them to retailers that sell them to the public. Though there is a phone number to call them. There foggers are not cheep, if I remember correctly they run about $300-$400.
I have not yet used the foggers but plan to. Here are a few links I found. Also the more jets/Disc it has the more fog it will create.
Ultrasonic Water Fogger-The Mist Maker
http://www.greenair.com/old/fogger.htm
YouTube - Fun with ultrasonic fogger
Pond Lighting & Water Features: Ultrasonic Disc Foggers