Humidity ( moisture absorbers )

[Just done]

Hi guys . In my tent is really high humidity, like 80%. Anyone ever tried these moisture absorbers, or wardrobe hanging dehumidifiers ? Do they work ?

 

[Bruce Campbell]

How many plants do you have, what is your ventilation like, and what growth stage are you in? Are you venting outside / to the attic, or just to the lung room (i.e., the room that the tent is in)? What are the temps and humidity in the lung room like?

Overall, desiccant-type dehumidifiers like those may be too low capacity for the amount of water you need to remove.

Here's some typical (per plant) water consumption rates:

For example, here's one that sounds like what you're thinking of, but it only has a total capacity of 4-6 oz before needing to be recharged. Meanwhile, 450 mL = 15 oz. Most of your actual moisture removal usually comes from ventilation, so I'd recommend modifying that first based on your setup. If you do try dehumidifiers like those, I'd make sure to put them in the path of your intake air flow.

 

[Just done]

How many plants do you have, what is your ventilation like, and what growth stage are you in? Are you venting outside / to the attic, or just to the lung room (i.e., the room that the tent is in)? What are the temps and humidity in the lung room like?

Overall, desiccant-type dehumidifiers like those may be too low capacity for the amount of water you need to remove.

Here's some typical (per plant) water consumption rates:

View attachment 1358096

For example, here's one that sounds like what you're thinking of, but it only has a total capacity of 4-6 oz before needing to be recharged. Meanwhile, 450 mL = 15 oz. Most of your actual moisture removal usually comes from ventilation, so I'd recommend modifying that first based on your setup. If you do try dehumidifiers like those, I'd make sure to put them in the path of your intake air flow.

Im venting in to my house , it’s high humidity in the house aswell so Intake air is high humidity. I was thinking more about these. Like hang 5-10 in tent .

 

[shumway]

Im venting in to my house , it’s high humidity in the house aswell so Intake air is high humidity. I was thinking more about these. Like hang 5-10 in tent .

Best bet is to just go buy a normal adjustable dehumidifier and get the whole house humidity down 1st or even just the room the tent is in

 

[Bruce Campbell]

Best bet is to just go buy a normal adjustable dehumidifier and get the whole house humidity down 1st or even just the room the tent is in

^^^ Yes. Nothing you put in the tent is going to be effective if you're just bringing in humidity from the room / house to replace the moisture you remove inside the tent.

Once that's dealt with, you can add some additional removal inside the tent if needed.

Technically desiccant-type moisture absorbers "work," but they are capacity-limited, which means you could end up paying just as much or more for those than a standard thermal dehumidifier over time. Their performance (rate or speed of moisture removal) can be higher than thermal dehumidifiers, but is dependent on the amount of air flow they get (whereas thermal dehumidifiers typically include a fan in the unit).

Also, note that those ones you pointed to are just calcium chloride - which is what is used for road / sidewalk de-icing in the winter time. May just be cheaper to buy a bulk 20kg bag of road salt (or silica beads) and dump them into a 5 gal bucket with a fan.

 

[Sheriffatman]

Those little pots don’t do a thing, I used them myself, don’t waste your money. By an adequate dehumidifier for your size tent. I just bought a pro breeze dehumidifier £40. And I don’t think that’s made a blind bit of difference as I vent from outside into the tent, . What you really need to do is control the room your tent is in, you will get much better results.

 

[Tom Bombadil]

get a big ass dehumidifier and do the whole house. thats your only option.. in the meantime raise temps a bit and blast the room with a fan..

 

[Mañ'O'Green]

You might be able to control the humidity in the lung room with one of these but if you are just recirculating the air through the tent back into the lung room you will run out of Co² for the plants?

 

[Bruce Campbell]

@Mañ'O'Green See this thread for a discussion of CO2 needs. Only a small percentage of water is used for photosynthesis with the rest being used for just transpiration, so the CO2 needs are a lot smaller than you'd expect. Each plant should only need on the order of ~1 cfm of fresh air for CO2 purposes, which shouldn't be an issue for any typical home setup.

 

[Mañ'O'Green]

@Mañ'O'Green See this thread for a discussion of CO2 needs. Only a small percentage of water is used for photosynthesis with the rest being used for just transpiration, so the CO2 needs are a lot smaller than you'd expect. Each plant should only need on the order of ~1 cfm of fresh air for CO2 purposes, which shouldn't be an issue for any typical home setup.

I had a Co² monitor when I was running Co². 6 plants in a 4x6x8 would use Co² from ambient ~410 PPM down to less than 100 PPM in 3 hours. They will stop growing at 150 PPM.