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OfflineSydoku
innocent bystander


Registered: 05/06/10
Posts: 185
Loc: Canada Flag
Last seen: 12 years, 7 months
FAE confusion
    #12580241 - 05/17/10 04:38 PM (14 years, 8 months ago)

I did multiple searches and found a few topics on this, but didn't see anyone actually give a solid answer. If someone has answered this question in the past 7 years- sorry I missed it, it can be hard to find things sometimes with search...

In a SG FC, you have like 100 holes all open, yet you are suppose to mist and fan numerous times a day to achieve FAE. Why with a monotub can you go the entire grow without ever lifting the lid, yet you have less open are for air flow and its filled with poly fill- How does that work? I don't understand how there can be such opposite extremes.


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passing ambition

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OfflineDharmatripper
Deceased

Registered: 09/05/09
Posts: 291
Loc: Over here
Last seen: 6 years, 5 months
Re: FAE confusion [Re: Sydoku]
    #12580386 - 05/17/10 04:59 PM (14 years, 8 months ago)

The quick and dirty:

You have to mist SG FC because all those holes are open.  The fanning and open holes really get the air exchange going.  It's easy to get proper FAE in a SG FC because it's all opened up like that but pretty heavy misting is often required (dependent on ambient conditions) to keep the the RH up.   

With Mono's, you have the opposite:  you have a lot more substrate which releases h20 into the tub which is partially retained by the lid and polyfill.  The polyfill, while allowing some water retention, allows air to pass through (though often not as abundantly as a SG FC) and thus, FAE occurs.  Generally, you don't need to mist but you need to have a fan running to increase the air movement through the polyfill (you don't HAVE to but it often helps).   

So they are sort of like opposite sides of the equation.  In my experience, it's easy to get proper FAE in a SG FC but the humidity is what you need to watch; contrarily, in a mono, it's the humidity that's easy to get and the FAE you need to pay attention to. 

Both have thier respective challenges and dynamics in terms of controlling FAE respective of humidity.


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This is not me...

Edited by Dharmatripper (05/17/10 05:08 PM)

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Offlinejingus

Registered: 05/04/09
Posts: 1,669
Loc: Oregon, U.S. Flag
Last seen: 11 years, 11 months
Re: FAE confusion [Re: Dharmatripper]
    #12580522 - 05/17/10 05:18 PM (14 years, 8 months ago)

well said


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