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Edelweiss grows on top of the Alps. Let's grow roses there too, and tulips. They will do great. You did not come up with a link, @Tetrahedral , and all your other examples are anecdotical. So a serious conversation with you is impossible. Too bad. You are a fine example of the bro science...

What brand of nutes do you use? No funny smell? No signs on the leaves of anything missing?

Then you do some push ups in the room. You will see that the CO2 will go up soon enough. :)

It is not that much water. For every kilo of CO2 that you produce you will get about 0.8 kilo of water. Little less then a quarter Gallon.

The TO is from Switzerland and Jack's does not send anything to Europe. The 15-0-0 you can buy. Calcinit by Yara. (Jack's probably buys it at Yara as well :) )

Nice chart by Pulse, but how did they come up with these numbers? What is the scientific basis for them?

I don't use a chart. I even think that the charts that you see on many cannabis sites are off. Too high IMO. My guess is that they come up with these numbers like 1.4 because with a high VPD you have less chance of PM and Botrytis. And often they don't even consider leaf temperature. A plant...

I know how google works. But I can't find any scientific based paper that says that 1.7 is within the ideal range. But apparently you did, so I am curious. I mean this seriously as there are hardly any decent studies on VPD for Cannabis. Most things that you read are of people repeat each what...

Please give me the link where it says that a VPD of cannabis of above 1.7 is ok for this plant. 'OK' in the sense that it is near ideal values. It would be scientific news. And a link that makes sense, not one of some stoner. Sure a plant does survive, but you want to try to maintain ideal...

I don't say that they do anything wrong.

At least one of the people who posted here, was caught posting pics which were not his. So that makes me think. But again, no proof.

That is sealed enough. Most growers who run CO2 have a small exhaust fan with filter, to create under pressure, so smell can not escape. So even that is ok.

That humidity is really low. That's a VPD of 1.9-2.1 (if your leaf temperature is around 78 - 81)

Just look at the VPD and you will be fine with a wide range of temperatures and RH's. The numbers posted above say nothing if they are not related to ambient temperature, leaf temperature and RV. 75 F and 30% humidity is just a bad advice. If your leaves would be 72, your VPD would be over 1.7...

I can not prove it, but I am under the impression that not all pics (and members) in this topic are real. I might be wrong though.

In Europe you can buy Yara. Yara Brown mixed with Yara Calcinit for example. Also you can buy GHE Maxigro (GHE is in the process of changing their name to Terra Aquatica) But if you are not an experienced grower and you have problems reading your plants, I would suggest to stick with the...

How much did you pay for it, including shipping and taxes?

I guess people don't even read it. It is written like a concrete block of text. Not very inviting to read.

OK :) I thought you meant Dissolved Oxygen. And I could not find a way to place that in your story. So wondering what other meanings there were of the abbreviation of D.O. But is clear to me now.

Oops, I meant 'RH'. RV is the same, but in my native tongue. So what is DO?