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OfflineGregP
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Registered: 06/09/16
Posts: 75
Last seen: 7 years, 1 month
Humidity
    #23508123 - 08/04/16 01:25 AM (7 years, 6 months ago)

Can't seem to get the humidity in my sgfc above 90%. I have a small air pump that came with my original Midwest grow kit that I added as well as misting and fanning regularly. One tube from the pump is in a jar of distilled water with hydroton and the other hose feeds into the chamber and sleep gently mists. I keep it running 9-10 hours a day. Maybe. I just need to run for 24 hours a day?  Any ideas?

And, chamber has 1/4" holes 2x2 all 6 sides and is raised. Cakes are on lids which are on 4 1/2" of perlite. Chamber is in a closet.

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InvisiblebodhisattaMDiscordReddit
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Re: Humidity [Re: GregP]
    #23508158 - 08/04/16 01:52 AM (7 years, 6 months ago)

Who said humidity should be that high anyway?
Link me to where air pumps and humidifiers help remedy the problems.

SGFC humidity should be 50-80% and 90-99% a quarter inch from the surface of the cakes as moisture evaporates off the cakes into the fresh air.

A SGFC has a lot of problems if the humidity in it is 90%. Considering it has so many holes in it.

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OfflineMushierage
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Re: Humidity [Re: bodhisatta]
    #23508255 - 08/04/16 03:29 AM (7 years, 6 months ago)

Sounds to me like your SGFC is fine dude.  It doesn't have to be 90% all the time, and you do want humidity to rise and fall, as it aides in the evaporation of water from the substrate which is a huge pinning trigger.  Your surface humidity is pretty important though, that is why you case your substrate or dunk and roll cakes.  It provides a microclimate at the surface.    The air pump in an SGFC is really not necessary, and will create positive air pressure inside which disrupts the natural pressure gradients that cause air to draw up through the moist perlite.    I've had success many many times with your exact same specs on the chamber, in a room that's 40% rh and no pumps and 70 degrees F. 


Also I suggest getting that thing out of the closet.  I have mine sitting in the middle of a room and it never gives me trouble.

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Offlinespacechildo
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Re: Humidity [Re: Mushierage]
    #23509057 - 08/04/16 10:28 AM (7 years, 6 months ago)

not so much about air pressure, its about drying out cakes too fast and pumped in air being hard to dial in just how much your chamber can handle.

remove all pumps and hygrometers and simply use your eyes to look at the cakes. glistening = fine, not glistening = mist.

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OfflineGregP
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Registered: 06/09/16
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Last seen: 7 years, 1 month
Re: Humidity [Re: spacechildo]
    #23509093 - 08/04/16 10:42 AM (7 years, 6 months ago)

Thanks all. It's 90% right by the cakes. I tend to overthink things. Also, the vermiculite I had in my first batch was super coarse. This one is more fine. Not powder but more fine. Does that make a difference.

My first setup from Midwest was a fruiting chamber with no holes so I guess they gave the air pump to create humidity. I just took it out so I will check the humidity in a little while. I just thought humidity had to be 99%.

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OfflinePsilicon
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Re: Humidity [Re: GregP]
    #23509113 - 08/04/16 10:50 AM (7 years, 6 months ago)

No, the size of the vermiculite doesn't matter much.  For dunking and rolling smaller is better, but what you have will work fine.  For use inside the BRF cakes, IMO it doesn't matter at all.


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