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The carbon filter I'm eyeing has two versions - one is tall with a thinner layer of carbon, other is short with a thicker layer of carbon. Which one is best?

Nah, man. They're full size. Maybe it's a heat issue? It's 30C in there.

So, my 1000w HPS bulb is currently 20" from the nearest plant and its top leaves are curling up and there is light burn in various places. I was going to put it up higher, but then I saw that the lumen output becomes significantly lower the further away from the plants the light is. What does...

I've got 10 clones in root riot cubes in a humidity dome for about two weeks now, and none of them have rooted. At first, I kept misting them every day but I read somewhere that if you keep doing that the plants won't grow roots because they'll get all the water they need from the spraying...

I'm using Soil.

I'm a few days into flowering and I'm not sure which nutrients to buy.. there are about a dozen options. So far, I think that Bio Bloom and Sensi Bloom seem like good candidates. Any input would be appreciated!

Yes, I have. I have been funneling the air into the house, and the smell outside the house has disappeared. However, the smell in the house persists, even without an intake. I had to leave the door to the grow room open for intake, of course, otherwise there would be no intake, so again, it's...

So, I have to buy a bigger carbon filter for my grow room and I'm perplexed. Some filters are longer with a thinner layer of carbon and some are short with a denser layer of carbon, all while having the same M3h rating and the same price. So, what do I choose? I figured a thicker layer of...

I increased the intake last night and the smell definitely went away.. although, I also shut off the lights at the same time, so maybe that was it? Overnight, I left the exhaust funneling air into the house, and I definitely smell marijuana in the house. One more thing - the sleeve on the...

No, that's also impossible. The fan I'm using for intake is rated at 75CFM. There is no way it's pushing more air in. In fact, I was thinking of doubling up and getting another one.

No, but that still doesn't make sense because: The fan is exhausting smell into the attic. This means that if it really too strong, there still shouldn't be any smell in the room next to it and instead only in the attic. Since this is the case, it's obviously not a case of a fan being too...

How do you figure? That makes the fan TOO GOOD not bad.

Yes, but it's a Delta fan, essentially a supped up PC fan, so its air pressure is much lower than an inline fan. I guesstimated that it's about equivalent to a 240M3H inline fan, or at least somewhere in the area.

If you can smell marijuana from your exhaust (as in, air that was supposed to already been filtered), then your carbon filter is crap. That's not my case. I don't smell anything from the filter itself, just the surrounding room. Which should mean that the filter can't exchange the air quickly...

My grow room is 6.5' H x 7' W x 4.5' L. This amount to about 200 Cubic Feet. My carbon filter is 240M3H and my fan is rated at 300 CFM which is equivalent to 510M3H. And yet, there is still a strong smell inside the room and a faint smell outside of it. Isn't this enough? Why is there smell...

My grow room is 5 feet x 3 feet and 5 feet tall and it gets to 32C with my 1000w HPS. I have a 75CFM intake fan coming from outside and a 250M3 carbon filter and fan for exhaust. How do I cool this? I heard of an air cooled hood for the lights.. does that cause a significant temperature...

Okay, so here is how it is: I have an array of 540w CFL bulbs which produce ~22,000 lumens. I want to buy a better bulb with a ballast for two reasons: 1.) My plants aren't growing very fast under the CFLs. 2.) I need something for flowering, which the CFLs won't do. So, I have to get HPS...

Then why is that new leaf turning yellow..? I'm using just regular tap water, btw.

Okay, so it's been about a week since my first leaves began getting yellow. Now, a week later, this is how they look: Now, I was told that this isn't a problem because it's just the bottom leaves, but now.. The top leaves are yellowing too! Look at this little tiny leaf.. it's yellow...

I am quite excited about learning how to grow marijuana. I've been reading up a lot, watching documentaries.. I really believe marijuana is a miracle. As an absolute beginner, I have some questions: 1.) Seeds. Which seeds should I buy? There are hundreds of strains and every website has a top...