i have been looking at these machines from argos as they are well cheap, i am just wondering has had experiance with these before and if they work any good? Now with the Humidifiers is it best to get one that releases warm or cold mist? and would Humidifiers work ok for us as it will be releasing water spray in the grow which i do not want to get any rot?

Hey bro, im unsure of the models your talking about, but you really wanna go for an ultasonic humidifier, dehumidifers will have a rating to them what is it

If your airflow is correct, you shouldn't need to mess around with humidifiers/dehumidifiers.

If it's not correct, you will have far more problems than the humidity level to worry about...

if ya want to humidify i think the best thing to use is them pond foggers the bigger the better if ya use a tent single ones will do but if its a room ya want a 5 ceramic one
the ultrasonic humidifiers work in a similar way to the pond foggers but dont last that long the ceramic thing goes on em and are hard to replace were as the pond foggers ceramic thing are much easier to replace and are only a couple of quid each from the right place
foggers win hands down in my book
just place a fan to blow over the bucket the water fogger is in they are great for raising the humidity levels

Unless his airflow is adjustable, how is he going to keep the humidity high for young clones,plants, and bring it down for flower/harvest, maybe I misunderstood and your just telling to him worry about your airflow more, however you just made it sound like using de/humidifeirs is wrong, when IMO growing without them is more wrong, not picking an argument brother just expressing my opinion

I use both humidifiers and dehumifiers.got a ultrasonic honeywell humidifier £45 quid from Argos 5 litre tank works a treat for when there young. My temps and humidity are pretty good a controllable but got a dehumidifier for lights out so it stays at 45% humidity got the dehumidifier from Argos but can't remember the price my conditions are fine but got some main colas that are nearly as big as 2ltr coke bottles but wider so run it coz there so dense I worry about rot.

That and making dank buds are 2 good enough reasons for anyone to invest in a dehumidifier no

Honestly, all you need to do is make sure you are extracting and intaking adequately for the space you are growing in... messing with it is highly likely to introduce problems such as mould.


Dank buds.. ?

Look, the air on this planet is great for growing pot. All you have to do is get enough of it and exchange it once your plants have used it.

I'm not going to go on and on, but these machines are a complete waste of money. If your humidity levels aren't right, you need to sort out your airflow.

Agreed all i ment was theres nothing rong with fine tuning if you so choose to do so, i do agree with you if your flow is correct you can adaquetly bang out a grow from start to finish without de/humidifiers

dont agree

theplantissick:

thanks mate was looking at the ultra sonic ones ^_^

eri:

Really, so by what means could i change things then as i think my enviro is bang on except for my RH, as my fans are on primair which do everything i need for air flow, lights off temps between 22oC and 24oC, lights on temps between 27oC and 29oC? with air cooled reflector

NMW:

Thanks bro will look in to them but im pretty tight on space

theplantissick:

Hey mate i can control my air flow with my primair, i think i def need the machines as lights on my RH is min 30RH and max 45RH, and lights off is the bad bad news which RH is around 70RH - 81RH!!! not good for when i start flowering

evil vince:

Thanks for advice mate

So if i can control RH by the control of my airflow would be great other wise looks like im gonna have to get a couple of these machines

hey eri so how would i go about sorting air flow as temps are fine??? i got my primair idle prettylow on lights out do u think i should up the idle to get more air exchange going on to bring down RH??? but doing that is going to lower my temps the more air exchange i get?

You know what every grow room is like and what all growers need then, eh?

I live in a humid area. On a peninsula, surrounded on three sides by water. My air flow is great, but when the fog rolls in my rh shoots up a good 20 points. Sometimes more. A dehumidifier is perfect for me as it handles these peak rh moments in me flower room nicely. I've been much happier with my dehumidifier, thank you very much. As a bonus, it boosts the temperatures in the room at night as well. Win all around. I also need this as I have a fairly large grow going on.

Some folks here have reported nice results with a fogger. Personally, the only time I need high humidity (again, where I live has to be taken into account) is for my cuttings and then I use a dome to isolate the cuttings area. The dome has adustable vents so I can moderate the rh/airflow. Trial and error has taught me what the signs are of a good humidity level and for how long to maintain an elevated humidity level.

Personally I would stay away from a combination humidifier and dehumidifier. More likely that they will break and perhaps at a critical moment. Then both units are out while you get one repaired. Also there is a better chance that it is made uber cheaply.

btw, my air flow is pretty hi tech. I have two expensive controllers controlling two exhaust fans (6 inch and 8 inch) with a 10 inch cf and 8 inch ducting and twolarge oscillating fans above and a few below my trays.

thanks Randalizer for the added info, seems to be quite a bit of confliction on this subject

81rh is 10x worse than 30

wouldn`t be without our dehumidifier we got mould on our first hydro grow now we always put it in at the end of flowering.

what harm would my plants be coming to at a RH of 31 at lights on then ? oh sorry wrong way round u mean 81RH is even worse at light off dam man

i think i might have to get de hu.... for when i enter flower

even with a good air flow in and out you can still get low RH when the lights are on the more lights the lower the RH will go and especially if the plants are just little so foggers can help raising the RH in veg but ya dont need em in flower as the plants grow bigger the RH will usually go up in ya room so a dehumidify can be handy in late flower

Yeah, your extraction should be on full all the time, 24/7. This is likely to be your problem. Make sure you're extracting to outside to facilitate proper exchange of air, at the correct rate for the size of your room, and with an active intakes if it's bigger than about 1.5m square (smaller and passives should suffice), and you should be fine.

nice NMW yeah my plants are like 4 weeks into veg also

ERI

ah so my problem lies in my primair being too low for my extake....right lets turn things up a notch then, and if thats on full my intake would need to be on full also as i do not use passives my ext is 125mm and my intake is 100mm, lets get things full power then, and lets hope temps dont drop too low :-(

Yours is an exceptional situation then, but to be honest I would be amazed if your plants wouldn't be ok regardless. Cannabis is quite tolerant with regards to humidity, and if you're extracting properly in this country you should have no problem at all.

Sorry but I think your way off dude.

I now have a sealed room and the air is changed once a day. I have an Ac dehumidifying as it cools and I also need a dehumidifier as well to keep the RH below 60%

I used to have a conventional set up and My intake air would be way to cold to be pulled into my grow at any kind of speed. I often found that under my canopy was sub 10C while above was 26+ so How exactly could I have solved the problem of high humidity by turning my fans up without freezing my plants??

I'll save you the bother. The answer is I couldn't. The only way would be to bring my intake air from inside the house and keep the heating on all day to make sure it is warm enough. Not an option so I opted for the whole air con+co2 etc option. An now I have no problems at all.

Kind regards, Maxi ;-)

P.S. your not wrong in what you say you just fail to realise how different peoples setups can be I think.

The plants are okay, but I like to create an ideal environment. And it's not so much the plants, but the molds and fungus issues. Bud rot anyone?



Word.

Stop trying to speak for all growers and all grow situations and you will give much better advice.

The one point I fully agree however is that, generally speaking, one should get ones air flow sorted before considering dehumidifiers and such. Once air flow is properly sorted, if you are still having problems with rh levels, then dehumidifiers are an option to consider.

ah so my problem lies in my primair being too low for my extake....right lets turn things up a notch then, and if thats on full my intake would need to be on full also as i do not use passives my ext is 125mm and my intake is 100mm, lets get things full power then, and lets hope temps dont drop too low :-(

EDIT: so i have just turnt my primair idle s both to full for int and ext as im in lights off now and my int is pulling in air from outside, so u dont suggest this? ah this is getting confusing i think my easiest option is just to go and get a de hu and a hu machine

ac lowers humidity it doesnt raise it

Depends on what the out side air temp is mate.

If it's cold out side then you dont wanna be pulling it into your room without heating it first (can be expensive) or you could pull air from your house and then extract out side. (ok as long as your grow and fans aint to big and your not pulling all the heat from your house and extracting it out side -see can be expensive )



Sorry who said ac raises humidity? My plants do that for me ;-)

Kind regards, Maxi ;-)

thats what i find too

this is getting way out of hand,
typically increasing airflow will decrease humidity, so will aircon,
turning your fans up may make it colder in there with lights off, however anything above 65 is okay, the problem is you dont want more than a 15 degree drop day/night so if your hitting 65 lights off its okay aslong as its no higher than 80 lights on,
providing you arent supplimenting with co2

If i were you id rather deal with the problem of cold nights simply buy getting an oil filled radiator with a timer and thermostat,

thanks maxi for the advice, i think im just gonna have to deal with the RH problem untill wed next week when i get money to go and get couple machines to sit in their, thank u everyone for all your insight!!!! some very nice opinions and think my minds made up on the machines now

theplantissick:

thanks mate, so if i got a oil filled rad that would raise the lights off temps and thus decrease the high humidity right? so having no need for a humidifier?

High humidity is only really needed for cuttings that are trying to root.

The only real worry for high humidity is for flowering. Unless you are over 90% (during vegging) and then you better have some amazing air flow going on.

correct, now youve turned your exchange up your going to see what your rh hits tonight, if its still not low enough i.e 50 then your going to turn your airflow back down so the room stays warm enough at nights and invest in a dehumidifier apposed to, airflow up and a radiator

mhhhhh oil filled rad or humidifier mhhhh decisions decisions

oil filled rad, cheaper and less maintainence

very very very nice info!!!! i will be going in few mins b4 lights on 2night and if RH is not as good as im hoping then fans are getting idled as b4 and humidifer/oilf rad will be going in next week thanks a lot mate

EDIT :

phew thank god that problems sorted out in my head now

No problem bro, bare in mind if you did have the rad in there right now keeping that air warmer, it would also help lower your rh, so say right now for example with fans up an lights off your rh is 60 and temps are 65, by putting a rad in there and raising that to 72 degrees this could also drop your rh to 50, edit sorry to blow your mind, what im saying is in a while when you check if your still above 50rh, the raditor is still an option as it will help bring that rh down

seems like a win win with the oil rad path, keeps closer to lights on temps in lights off and lowers RH nice, i think my mind has changed from a dehumidifier

thank you everyone tt44

to elaborate further, unless your growing clones in your system, in that room low rh isnt going to be a problem infact its very good i purposly drop my rh to 35 during flower

so to cut a long story short if you invest in a oil filled rad. in veg you can just mist young plants in the morning, at night time ur 50rh will be fine then in flower your 35rh in day time is good and 50rh at night with good air flow should be okay, but for the sake of 40 pound extra you could also buy a humidifier, this will improve day time veg rh and voila

thats spot on theplantssick you sure do know your stuff top grower thumbsup

I think I'll add one last word as well.

The thing to do is to figure out what sort of environment you want for your plants (what rh levels and range, temps, etc), what tools are available to do this (hot air/cold air, etc), and how to properly use those tools.

This goes for most aspects of canna growing. Know the theory, know your environment, know your tools and how they affect your environment and then make up your mind as to what to do.

Each grow is different (some more than others) and each requires you, the grower, to decide as to how to make your plants happy.

Yeah, your extraction needs to be on full, all the time.

An oil radiator is a solution I can get behind. I've used them plenty to raise temps where necessary.

I think people often very quickly turn to humidifers and dehumidifiers when it is very, very rare that they are needed.

thank you Randalizer i will be doing much thinking untill i have the money to buy my new tools next week, so im sure my mind will change several times b4 i take the trip to the shop ^_^ so plenty of time to ponder, over a few J's of course

i dont know if this will cause a new problem but if the fans need to be on all the time surely that depends on grow size/fan size etc other wise it seems bit pointless on my end to have got a primair to control temps? bit confused

Do some research here as well. Loads of quality information about.

Your air exchange and temps are two separate aspects of the environment and need to be treated as such... If temps are too low, the solution isn't to worsen your air exchange, but to warm the air

that really clarify's things mate!!!!! thank you!!!!

i wish i didnt fork out £115 for a dam primair now!! grhhh any one wants to buy 1

Here is what you need brother, im unsure if this is overkill i havent even checked your room out but it has a timer aswell as a thermostat as well as level 1 or 2 p.s thanks for the comments bro makes helping feel all the more worth whil

no thank u mate ^_^ that looks a bit large as i dont think id have the room as my tent is 1m x 1m x 2m tall, apart from that it looks spot on, just saw one on argos for £19.99 looks like its small enough to fit in my space,