Quote Originally Posted by Prodaytrader
oldmac few questions:

If I resolve my pump issue either by getting a cyclone pump or a diaphragm pump which I hear will also work, I can get the proper 50 psi needed for a high pressure aero.
I'm not sure that 50psi and those misters will get you to true aero. What you have going now is hydroponics with some fog added. Most of the true aeroponic systems are running in the 100+psi range and use misters with much smaller orifices. Your proposal sounds like a FAG system (fake aeroponic growing).

If I could design something that would allow for two chambers one of which is a shallow one for the plants, then can I alternate between the wet and dry all the way to flower?
Yes. In fact I've built two smaller and cheaper versions of "fogfognugen" that use shallow trays and some misters and a "bucket of fog" based on a 5 head pond fogger in a 5 gal bucket. The lid of the bucket has 2 holes, one with a pce of pvc to act as a hose fitting for the fog out. And a second hole with a muffin fan on top, blowing INTO the bucket to push fog out.

The wet I could feed into the side of the shallow chamber like you did, but how are you moving the fog through your chamber?
In my case the FrapaPlas fogger has a fan built into it that blows thru the ultrasonic torch blowing the fog out. When introduced to the trays, the fog will distribute itself. You are trying to raise the relative humidity to 100%, when it gets even close to that it will start to condensate to droplets on the roots then it's time to stop the fog for awhile. Consider also if building fresh to put your plumbing external to the tray lid and consider puting the misters in the top of the tray. That way they are always above the root mass. Also shallow trays allow the tap or water roots to grow to the bottom and can feed off excess nutrients that puddle there.

What kind of fan is reliable enough to move the fog? I've burned up 3 thus far with my fog alone.
In the bucket of fog I used regular muffin fans, but "moisture proof" muffins are available and are a better choice

Also, it seems my net cups aren't fully taking advantage of the holes. My slits only go up half way, which maybe isn't sufficient with fog?
That should not be a problem, enough fog introduced to the tray will seek out everywhere to be. Keep in mind relative humidity, it would be impossible to raise it in only one part of the tray without it raising everywhere.

One other thing, given that I have low pressure sprayers in there now and the fog, I decided to run both simultaneously until I can afford the pump and a second timer not to mention all the chamber parts, what kind of timing should I be using? I am still keeping the nutes in the 100 to 150 range since I'm still using the fogger. My current timing is 10 off and 2 on running both together. Seems to be workings but like I said the roots are also changing so I don't want to over water and kill them all.
Since this timing seems to be working good then it is fine. The off time sounds very good to me, the on time probably favors the mister side of things not sure how much you get from the fog in just 2 mins.
In my current fogfognugen setup the high pressure mister side runs 7 seconds every 1/2 hour. The fogger runs 10 minutes every 1/2 hour and the events are off set by 10 mins. ie: top of hour misters run, then 10 min later the fogger runs for 10 min and 10 min later back to pump/mister event.
Also I should note that fogfognugen is a "fog to waste" system, there is no recirculation of spent nutrient solution. I'm currently running the pump/misters at 200-210psi and with impingement nozzles with just .012" orifices this "aero" is very much a fog.

Hope some of this might help you. I have a thread from about a month ago showing a little bit of setting up my aero/fog tray, I'd love to link it here but I'm too lame on a 'puter to do that. Look for it in the "hydro" section, maybe I'll bump it up so you can find it easier. Have a couple of "fog" pics in it. I would love to see more people trying to use fog, it really is a great way to grow.
oldmac Reviewed by oldmac on . What now??? A few weeks back I built a pure fog system. Plz no suggestions about switching to a new method. I have my reasons for doing fog. At any rate, about 4 days ago I dialed in the system and was getting really good growth and nice green leaves. 3 days ago I decided that the water was too dirty and that I should probably lower the ppm's in the water anyway, so I changed it out. I believe I took too long on the water change which was probably in the neighborhood of an hour. I wasn't careful Rating: 5