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It would be impossible for me to sterilize such a big container. What if my container isn't sterilized, but sanitized (washed) instead? Are you sure it won't go bad within a month?

What about adding small amount of bleach to water?

In case if you don't have access to water at growing area and you have to get it from somewhere else far from the place (many hundred kilometers), then you would bring lots of water at once to save fuel. You wouldn't want to drive hundreds of kilometers every day, would you? My question is -...

What do you mean by hotter than that when ingested?

I was extracting oil out of cannabis with isopropyl alcohol 99%, but I accidentally forgot the pot on the stove and when I looked, alcohol was all gone and oil was frying on max heat. I was at the same time very surprised to see that it happened all so fast, because I've done it before many...

The question is, what is RH % outside of the grow room? When you're taking in air of 70% RH, you won't benefit from ventilating faster, in my opinion. I had the same problem and I went crazy by ventilating up to 2 times per minute, only to see that nothing changed in terms of RH. Heater or...

But if vegging big plants isn't ideal, then there has to be some kind of difference compared to smaller plants. What is the difference?

For example, if plants are at peak in their maturity and take up most of the room, I don't see how could I get RH under 80% by ventilating faster when outside of the grow room is 80% RH at night, do you?

The place where I live, we have an average RH of 82% outside. If I ventilate fast enough, my room would be filled with humid air and no matter how many lamps are shining, they wouldn't be able to reduce enough RH. The less I ventilate, the more RH will be reduced by devices that emit heat, but...

You're right. Now it makes sense to me too.

Thank you for the information, J. One question though. How much extraction is there going to be if you have two extractor fans blowing which are both rated at 2000m3/h ? It isn't going to be 4000m3/h, is it?

Yes, that's what I was looking for. I was thinking myself maybe 0.2 air exchanges per minute (once every 5 minutes) wouldn't be enough in some cases when plants consume a lot of Co2 from air. In this case I think more is definitely better than less, but I'm just trying to understand if there's...

I think I just came.

Ventilating a room serves 3 purposes. 1) to reduce temperature 2) to reduce RH 3) to get fresh air Let's forget about number 1 and number 2. How much fresh air exchange is optimal for plant growth at day time? I really want to know this. Most of the answers are related to RH or temperature...

Do you have recommendations when I'm looking for an extractor fan that would be able to extract in a rate of 4600 CFM? (7800 cubic meters per hour) It would be nice if it fits to some kind of carbon filter too. Any brand names or webpages? Anything? I live in Europe.

Sorry. Delete please.

Example: Vegging for 10 weeks and flowering for 9 weeks = finishing with 4 plants per 1kW and yielding X amount of bud. Is it possible to yield the same amount of bud IN LESS VEGGING TIME by having more smaller plants per 1 kW of light? If yes, then how much vegging time would be reduced to...

I'm taking it as a compliment. I will probably decide for the favor of another ventilation style grow to improve my results before moving on to Co2 systems.

(I'm considering different things. Trying to understand which solution suits me better) As I understand, plants don't need Co2/fresh air when lights are off? Ventilation at night is mainly to reduce RH, right?

Ventilating a room serves 3 purposes. 1) to cool the room 2) to lower humidity 3) to get fresh air Let's forget about number 1 and number 2. How much fresh air exchange is optimal for plant growth at night?