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No need for cleaning in any way. You are overthinking :) What you can also do (if you are afraid of the transition) is give your plants a mix of veg and bloom for a week. Many of the charts of nute manufacturers also recommend this.

Ambient temperature by itself does not say everything. You have to look also at leaf temperature and at RV. This will give you your VPD, and if this is in order there is a really wide range with 'optimal' temperatures. What do you mean with DO here?

So that is about 7 liters (or little less then 2 gallons) per day. Curious what they will do at their peak. Thanks!

You always had your RV on the safe side because of fear of Botrytis. Will you run a higher RV/lower VPD now that you have the AirRos?

If you would compare this to a 4 x 4 then it would be 40 liter x 1.44 = almost 58 liter. 58 liter divided by 7 days = around 8.3 liters per day. 2.2 gallons per day.

1200 ppm is not dangerous at all. It is very common in schoolclasses for example. But a funny thing will happen when you will be in the room for several hours. Because humans exhale CO2, you will see the CO2 level on your meter rise to above 3000 perhaps. I doubt that you room will be sealed...

It certainly does, Willie. Too bad you had to get rid of 1 plant.

I was always under the impression that the water pressure is big enough to prevent roots growing into the filling port. But apparently not. Or did something else cause it? Question How many gallons did your plants use per day when they were both at their peak?

@Ovah Nice result! Do you perhaps remember how much water your plants used per day when they were at their peak?

@WillieP Did you ever continue with your plans of starting a mediumles grow?

ppm is old world and non-scientific indeed.

really? Do you have a link? Edit: I think I misunderstood you. You probably mean a calculator that tells you how much bottled CO2 for example you need for a room of a certain cubic feet if you want to maintain 800 ppm?

I guess if there is no dimming, you could also hang them a bit higher and loose some light on the walls of the tent. Concerning what to do with the plants... no idea.

Manufacturers also advice to add x ml to a liter, but we all know it is often only half of that :) So perhaps they advice to change after 1o days is because they want to sell more nutes.. With the ph - and + you might have a valid point. I think that with DTW you could more easily test if your...

With surface I meant: Is it on a 3 x 3 or 4 x 4 or what. I am not an exert on Led but often those kind of lamps give a wattage that is not what they consume. the manufacturers want to pretend that it is equal to a traditional light like HPS of a certain wattage. But even then... 3000 is outreagous.

On what surface is it? And is it a real 3000 Watt lamp?

Is this because the nutes can go bad? If so, do you think all brands have this 'problem'?

You are right. Sometimes you add something to your room like sulfer or a pesticide or a cleaning chemical for example that venting afterwards is required. I think to have an exhaust fan available - even if you grow in circumstances where you don't have to be afraid of smell escaping - is always...

I am not talking about venting. I am talking about creating under pressure to prevent smell to escape. That you use an exhaust fan for that, is right. I know how plants work and I know how they exchange gasses. But they are irrelevant for this discussion. The fact that plants uptake O2 and...

Kratky does work. But it has also to do with getting a lower level of water as well. My reaction was more that the remark your friend made is so useless. Of course in general it is the case that when there is enough O2 for a person, there will also be enough for a plant.