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I believe the rule of thumb from the overgrow FAQ was 1 airchange per minute for low temps, 2-3 changes per min in normal temps, and 3-5 in high temps. Also, while fans are generally better at pulling through resistance than pushing, I don't believe the difference is that huge. Consider...

only part of the co2 comes from microflora/fauna, but up to 50% of the co2 in soil come from the roots. From wikipedia If you suspect I'm a shill for o2grow, I don't see why. If anything, my post points out that o2grow does nothing for removal of co2.

I like this one http://www.htgsupply.com/products/growbright-6-inch-tall-boy-filter

I agree. Circulation is most important.

OK well then let me continue. Oxygen is only one half of roots respiration. Roots inspire oxygen and expire CO2. So getting rid of the CO2 is just as important as introducing fresh oxygen. This is where the increased circulation from larger bubbles is beneficial, and this is why rooms with Co2...

A big fan slowed down will not be quieter, it totally depends on the fans construction. Look at the sone level in the specifications and try to find the lowest one. I would recommend https://www.amazon.com/Panasonic-FV-30NLF1-WhisperLine-Line-6-Inch/dp/B001AHSDQU

12 plants per person in AZ.... if you can find a spot more than 25 miles away from a dispensary. AZDHS has a handy tool for checking if your address falls within that 25 miles or not. https://medicalmarijuana.azdhs.gov/GeocodeAddress.aspx The "as the crow flies" radius was amended in 2014 to...

No. THC degrades into CBN, not CBD. (often confused) Personally, I feel CBN may have as many or more therapeutic uses than CBD, and it seems people often attribute CBN effects to CBD

About $50 a g for top shelf crumble and shatter, on down to $25 a g, which can still be decent. Top shelf may top out a little lower in legal states without grow rights. Before the price wars started here there was some very nice stuff for $32 a .5g. I mean so good I don't see how it could be...

Nope! Lookin' A-OK to me. Pre-flowers form at the bracts, and like their name suggests, they develop much earlier/faster than the main buds/flowers. Male pre-flowers would look like this. Notice the lack of any hairs/pistils.

pre-flowers and pistils

I don't quite remember as this was over 5 years ago and I generally don't keep logs for security reasons. It was a decent yielder though, not the best but not the worst. Blue Widow was a worse yielder for me as it was a slow vegger with practically no side branching. Scott's OG was a more...

Rare Dankness Scott's OG is the strongest I've had. Got sold some fake OG GTH#1 from The Seed Depot at the same time back in q3 '12. This thread makes me say DAMN I wish I would have got the real ones because I love paranoia and sweat inducing sativas. The Scott's OG were def the real deal...

I started off in a cab about this size (23"x17"x54") first with cfl's and a rather noisy 50cfm home depot bath fan. Then I upgraded to a 150w HPS and the fan couldn't handle it, so I upgraded it to a 80cfm Panasonic Whisper ($100) and OMG it was so quiet you couldn't even tell it was running...

No need to get hostile. I understand that smaller bubbles have more surface area and in turn are capable of imparting more DO, but fact is that water at a given temp can only hold so much DO before it becomes saturated. If you hit the saturation point with larger bubbles, smaller bubbles will...

It wasn't a scrog so much as a very tall sog, supported by screens. I think the purpose of no branches was the idea that water, nutrients and hormones are best delivered along the apical meristem. I think his idea was you get the most AAA prime tops this way, and less larf/smalls, even if the...

Small bubbles can also get stuck/cling to the roots easier, and gaseous oxygen is of no use to roots. It has to be dissolved. Not saying you can't have healthy roots with small bubbles, just postulating the idea that large ones may, at least in some ways, be better. Airstones restrict the volume...

DJ Short Blueberry circa 1997 BCGA Orange Crush circa 2000 ??? Pineapple Kush Royal Choice Farms Lemonhead OG Dinafem Blue Widow

IME coco retains a lot of water, almost as much as soil, so I wouldn't recommend 100% coco unless possibly if your running airpots. Smartpots or containers I would recommend rocks or hydroton on the bottom and perlite or hydroton mixed throughout. Do a search on "chow mix."

Have you considered not running airstones, just bare hose weighted down, due to the fact that large bubbles cause more turbulence and move the roots around a lot more, ensuring that oxygen-rich water is circulated throughout the root zone? It's not just about having high DO in solution, it's...