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OfflineFraggin
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Tips on maintaining humidity with perlite.
    #7853912 - 01/09/08 02:12 PM (16 years, 23 days ago)

This is the first time I have used a plastic tub for a fruiting chamber. I got rid of the martha a while back, because I Wanted something more mobile for small grows here and there.

I am using a large tub, like the one in RR's FC video clip on youtube.
I had drilled several holes and added about 5 inches of well saturated drained perlite.

Here's the tip:

I had problems keeping humidity above 70% and after some head scratching, I realized that it was because the cieling fan was on in the room that the fc was in. After I turned it off, humidity reached 90%.

If anyone else has some tips LIKE THIS ONE to add to this thread, feel free to keep the list going.


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OfflineSupplier
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Re: Tips on maintaining humidity with perlite. [Re: Fraggin]
    #7853949 - 01/09/08 02:19 PM (16 years, 23 days ago)

i recentyl had a dome type FC for 1-2 cakes and couldn't get it above 90% humidity. so i turned up the room temp and it got me that little extra 5% humidity and brought it to 95% :laugh:


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OfflineNibin
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Re: Tips on maintaining humidity with perlite. [Re: Supplier]
    #7853997 - 01/09/08 02:30 PM (16 years, 23 days ago)

Turning up the temp will decrease your RH. RH is relative to temperature.

The warmer the air the more water it has to get to saturate at 100%.

What are you using to measure your RH?


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Offlinejape
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Re: Tips on maintaining humidity with perlite. [Re: Nibin]
    #7854019 - 01/09/08 02:33 PM (16 years, 23 days ago)

For every hole I drilled I put in some poly-fill in, to retain moisture, while keeping air control. kinda like in monster Mitch's mono tub...yet smaller holes.


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Offlinemad genius
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Re: Tips on maintaining humidity with perlite. [Re: Nibin]
    #7854022 - 01/09/08 02:34 PM (16 years, 23 days ago)

Its funny this came up. My RH in my shotgun terrarium fluctuates from 95 to 100% at night when i turn my air conditioners on. And my terrarium is in a closet.


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InvisibleCaptain Cubensis
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Re: Tips on maintaining humidity with perlite. [Re: Nibin]
    #7854025 - 01/09/08 02:35 PM (16 years, 23 days ago)

Perlite FCs usually top out at about 92-95%, if you have enough holes drilled for FAE you won't get to 99% with perlite alone, IMHO.

Consider tubing an ultra into your FC, and mist until near saturation about every 20-30 minutes.

You can put it on a timer for 5 minutes on, then 25 minutes off.

Or whatever your situation calls for.


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OfflineNibin
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Re: Tips on maintaining humidity with perlite. [Re: Captain Cubensis]
    #7854036 - 01/09/08 02:36 PM (16 years, 23 days ago)

Or don't drill as many holes and fan more often.


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InvisibleCaptain Cubensis
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Re: Tips on maintaining humidity with perlite. [Re: Nibin]
    #7854071 - 01/09/08 02:42 PM (16 years, 23 days ago)

Quote:

Nibin said:
Or don't drill as many holes and fan more often.




While true, it defeats the purpose of a perlite FC, which needs as much FAE as possible to work.

You are correct, you could cover some holes and fan manually.

If you want more of an automated set-up, then try the ultra on a timer, and plenty of holes.

The perlite at the bottom does a great job of absorbing an excess ultra mist.


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OfflineFraggin
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Re: Tips on maintaining humidity with perlite. [Re: Nibin]
    #7854219 - 01/09/08 03:12 PM (16 years, 23 days ago)

Quote:

Nibin said:
Turning up the temp will decrease your RH. RH is relative to temperature.

The warmer the air the more water it has to get to saturate at 100%.






Higher temperatures promote evaporation, therefore it is logical that humidity from a perlite driven technique would increase somewhat with an increase of temperature.


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InvisibleCaptain Cubensis
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Re: Tips on maintaining humidity with perlite. [Re: Fraggin]
    #7854255 - 01/09/08 03:21 PM (16 years, 23 days ago)

I think the air moves around perlite due to differences in temperature, which create the convection effect. But I could be wrong.

If your FC was at 75 degrees and it was inside a room that was at 72 degrees, you would get more FAE than if the room were at 75.

Although the myc creates heat of it's own that gets radiated off, so in a sense, you always have warmer air (myc) surrounded by cooler air (FC), surrounded by even cooler air (room temp)so the myc/FC/room create their own little micro-climate.


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Invisible04281969
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Re: Tips on maintaining humidity with perlite. [Re: Captain Cubensis]
    #7854531 - 01/09/08 04:03 PM (16 years, 23 days ago)

Slipping a fish tank "bubbler stick" under the perlite, and adding just enough water to make it bubble, (with another good inch or two of perlite on top of that), can increase the humidity and fresh air circulation.


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Offlineverminute
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Re: Tips on maintaining humidity with perlite. [Re: 04281969]
    #7854584 - 01/09/08 04:12 PM (16 years, 23 days ago)

Quote:

04281969 said:
Slipping a fish tank "bubbler stick" under the perlite, and adding just enough water to make it bubble, (with another good inch or two of perlite on top of that), can increase the humidity and fresh air circulation.




It's best to place the bubbles in a jar of water, you don't want the perlite too wet, otherwise you're more prone to contaim. But yeah, exactly...

EDIT: More prone to contaim., essentially bacertia around the perlite. The shit can get expensive too so you want to keep it clean and reusable...

Also, another point, too much water and the cakes might sag into the perlite touching the tin-foil (if that's what you use) which is also another area for contaim.


Edited by verminute (01/09/08 04:14 PM)


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InvisibleSlimz
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Re: Tips on maintaining humidity with perlite. [Re: 04281969]
    #7854586 - 01/09/08 04:12 PM (16 years, 23 days ago)

Quote:

04281969 said:
Slipping a fish tank "bubbler stick" under the perlite, and adding just enough water to make it bubble, (with another good inch or two of perlite on top of that), can increase the humidity and fresh air circulation.




DING DING DING.. we have a winner.. beat me to it... i tilt my FC a littlt so the standing water is all on one side and stick the stick in that corner... works GREAT.. never USED the FC yet.. but i have already perfected the RH...


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Offlineverminute
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Re: Tips on maintaining humidity with perlite. [Re: Slimz]
    #7854606 - 01/09/08 04:17 PM (16 years, 23 days ago)

Quote:

Slimz said:
Quote:

04281969 said:
Slipping a fish tank "bubbler stick" under the perlite, and adding just enough water to make it bubble, (with another good inch or two of perlite on top of that), can increase the humidity and fresh air circulation.




DING DING DING.. we have a winner.. beat me to it... i tilt my FC a littlt so the standing water is all on one side and stick the stick in that corner... works GREAT.. never USED the FC yet.. but i have already perfected the RH...




Interesting... How much do you need to tilt, my FC is huge, that tilt would be way too much for me.


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InvisibleSlimz
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Re: Tips on maintaining humidity with perlite. [Re: verminute]
    #7854654 - 01/09/08 04:26 PM (16 years, 23 days ago)

very little.. i have a bible sized book under one end...


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Lazy Drywall Tek (no powdery mess)

This series will blow your mind and confirm what you already know to be true.
The Pharmacratic Inquisition
Best Thread Ever ! ! !

:pm: me if you have questions about lasers

Although i may advise others in a general way regarding all types of mushroom grows, and may even post question from other forums about growing "active" mushrooms, i only grow non-"active" mushrooms and edibles.

FeelFamily resident tech guru


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Offlineverminute
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Re: Tips on maintaining humidity with perlite. [Re: Slimz]
    #7854680 - 01/09/08 04:32 PM (16 years, 23 days ago)

Quote:

Slimz said:
very little.. i have a bible sized book under one end...




New testament, or old... Just kidding...

I like this method a lot, keeps the water from getting stagnate. I will see if I can work it with my FC.


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OfflineNibin
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Re: Tips on maintaining humidity with perlite. [Re: Fraggin]
    #7854851 - 01/09/08 05:05 PM (16 years, 23 days ago)

Quote:

Fraggin said:
Quote:

Nibin said:
Turning up the temp will decrease your RH. RH is relative to temperature.

The warmer the air the more water it has to get to saturate at 100%.






Higher temperatures promote evaporation, therefore it is logical that humidity from a perlite driven technique would increase somewhat with an increase of temperature.




The evaporation might increase but think of it this way:

For each litre of air you loose through FAE, you need to add more water to the new air to get it back up to 100% RH.

As you have increased the temp you will need even more water to evaporate to get to 100% (than before, when the temp was lower), so even though you are increasing the amount of water evaporating you are also increasing your requirements for evaporated water.


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InvisibleDontPlay
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Re: Tips on maintaining humidity with perlite. [Re: Nibin]
    #7854876 - 01/09/08 05:09 PM (16 years, 23 days ago)

Placing the bubble wand into a mason jar with water will do better than putting water in the bottom and tilting the FC lol


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