Humidity 70 % rH in flowering, with de-humidifier's

I have a 60x60x120cm tent, with 4 low ryders.
All looks awesome, except for the fact that since 2 days, I've been seeing a big increase in the relative humidity.

I've added two small de-humidifiers (cheap ones), but no change at all.
I can't get a $200 (more expensive, better ...) de-humidifier even if I want, cause the tent is already FULL.

With my lights off (120 W LED), it goes even to 80 rH. Temperature is ok, without lights it's 20 C, with lights ~ 23 C.
I have an exhaust, which does the job for the tent size.
I have one small fan blowing on the tops, and a small computer (CPU) cooler.

It's the 3rd week of flowering.

What more can I do to get it down ?

PS: From what I've read, the temperature plays a role in the humidity as well. High temperature = high relative humidity.
The facts show me the contrary ... The lights off, get me higher humidity. This means, I can set the room temperature to be higher, as much as I want. I'll try to increase the room temperature, the temperature in the room will go to 27-28 probably, but the humidity might go down ... will update.

Does your exhaust run when the lights are off? I keep my exhaust running 24/7. It's also hooked up to my carbon filter. Plants still stink when the lights are off, so I keep it running for smell and to keep my rh in check at night.

Sounds like you could use some more air flow to keep the humidity down.

Not a permanent fix but have u heard of or seen the humidity bags? Looks like a gallon ziploc you hang and it literally fills up with water. By no means is this a permanent fix but it may help you ball on your budget.

The 2 real reasons for not having high humidity are (1) carbon filters supposedly don't work as well with high humidity and of course the big one (2) is mold really likes it. That being said if you keep some really good air movement you should be gravy homie and always be mindful of overlapping fan leaves. Good luck

Where do you have the tent? what is the RH and temp. out side of the Tent?

I have 2 (small, 1L and 1.5L, not on AC) de-humidifiers, and 2 humidity bags as well (kind of old now, > 5 months).
My exhaust is running 24/24 also hooked to a carbon filter.

The tent is in a normal room.

The RH in the tent is 70% and temperature 24 C.
Outside RH is 55% and temp 22.5 C.

Problem is that they're kind of tight up together, they got much much bigger than expected.
Still need a solution to it though.

I've seen some de-humidifiers that cost > $150, which I could put in the room and make it lower, cause I can't put it in the tent that's for sure.

I have good air circulation.
Not sure if this are the only 2 real reasons though. The plants (themselves) might need lower humidity for their processes, but I might be wrong.

covert222 said:

The 2 real reasons for not having high humidity are (1) carbon filters supposedly don't work as well with high humidity and of course the big one (2) is mold really likes it. That being said if you keep some really good air movement you should be gravy homie and always be mindful of overlapping fan leaves. Good luck

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You could open up the tent to the room air and turn off the lights in the room at night. That should get the RH down to room levels (55%).
Another option might be to make sure you're not leaving any water hanging out unnecessarily - if you're normally watering to a runoff level of 20% as is recommended, perhaps water more slowly and stop watering at the first sign of runoff.
If you absolutely can't get your RH down, in future runs, look for plants whose genetics indicate good resistance to powdery mildew.

pope mitre said:

I have good air circulation.
Not sure if this are the only 2 real reasons though. The plants (themselves) might need lower humidity for their processes, but I might be wrong.

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There certainly may be more than 2 reasons for keeping your humidity low but the plants themselves, with exception to mold do quite well in high humidity

The 3rd reason would be that they sweat more, and don't drink the water through roots, but through air.
In the morning the humidity is 55, which is awesome, but that's just in the morning.

covert222 said:

There certainly may be more than 2 reasons for keeping your humidity low but the plants themselves, with exception to mold do quite well in high humidity

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I can open the tent at this point, but after 2 weeks, it will stink in the entire house.
I'll try to water them as little as I can, without hurting them from too little water (water doesn't get to all roots).
It rained this days here, that's why the rh might be that high, also outside the tent.
Once the summer arrives, it should get back to normal.

jeroly said:

You could open up the tent to the room air and turn off the lights in the room at night. That should get the RH down to room levels (55%).
Another option might be to make sure you're not leaving any water hanging out unnecessarily - if you're normally watering to a runoff level of 20% as is recommended, perhaps water more slowly and stop watering at the first sign of runoff.
If you absolutely can't get your RH down, in future runs, look for plants whose genetics indicate good resistance to powdery mildew.

Click to expand...

It's 55 in the morning but goes up to 70% during the day?
As it warms up in the tent the RH should go down.

You're right.
I was referring to my morning in the last post, not the plants morning, sorry.

jeroly said:

It's 55 in the morning but goes up to 70% during the day?
As it warms up in the tent the RH should go down.

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Have you thought about opening your tent and reversing your fan and running the filter out the side? This could maybe keep your smell mostly contained

You mean putting the filter outside the tent ? Don't think that's possible, maybe with other carbon filters, but mine has just OUT, no IN.

It looks like it got better now ... it's 52% in the morning (my morning), 60% in "normal conditions", and 65% when my lights are off. I think I'm safe for now. I'll see if I can buy a bigger de-humidifier, and put it inside the room in which the tent is as well.

Thanks for suggestions guys!

covert222 said:

Have you thought about opening your tent and reversing your fan and running the filter out the side? This could maybe keep your smell mostly contained

Click to expand...

medicropper on youtube was having amazing yields with like 99% humidity, he couldnt do anything about it and then it ended up seeming amazing for him. So long as theres awesome air flow I wouldnt worry too much

BUT

Thats just my $0.02