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Noice work. :)

There were lots of flowering (and other) posted at one time, but apparently there was a forum software change which made them disappear. A whole library of stuff. Poof. I agree that the archive is a less than excellent way to get the data. The solution is for me to roll it into a grow guide...

Water holds more oxygen at lower temps, 67 is eutectic but 72 will do. In hydroponics, 5.8 is the optimal pH. delta-9 tetrahydrocannabinol is... wait for it... a chemical. So yes, you are growing it for the chemicals. Thought you'd agree.

A 4.5 foot plant that yields on the order of 1-1.5lb can be reasonably expected to use a lot of water. That's a monster. This is tray no. 4 in my SoG system, for plants in weeks 6-8 (in week 6 as pictured). Yield off this tray will be about 1lb & a bit. There's 24x ~30" plants per tray and...

If that's the case, I think you'll agree that 'chemicals' are not uniformly a bad thing.

I don't have to bother with pH much, either. Good nutes will include pH buffers, such that when you mix for an appropriate strength, the pH will be set very close to 5.8-6.0. As the tank is depleted of nutes and topped up with plain water, the pH will wander upward and may require downward...

Not splitting hairs nor defensive at all. Merely illuminating the point that there's a lot of evidence-free urban myths about 'chemicals' out there.

Terrific. Firefox is (again) reporting that RIU has been reported as an 'attack site.' Hacked again? WTF.

It's nice that some localities have medical schemes in place, I maintain that if you ever have cause to fear LEO counting your plants or weighing your stash, your security culture needs a revisit. I don't tend to take too many pix because a perpetual op always looks pretty much the same. But...

No way a 36" plant will use a gallon a day. I think you probably have unicorns sneaking in during lights off & drinking your nute solution. But what would I know? I've only been growing dope for about a week.

H2O2 is a terrific steriliser for inorganic nutrient-based systems. You don't have to care about res temps because frequent (every 3-4 days) application will keep the water at max oxygenation. Water is a chemical. You still want a "chemical free" grow op?

uh- how big are these plants? They'd have to be 6+ foot trees to use 5L/day- and if they were that size, no commonly available artificial light would ever penetrate more than halfway through the canopy. Care to revise that estimate?

Yep. Wow, I've been running an op with 5L/plant for 15 years. I am pleased to finally know I'm doing it wrong and will sort that out straightaway. You probably should let Canna know about your discovery. Those fools are telling everyone to use 5L/plant, too.

I would not use any sort of filter to remove chlorination. Simply unnecessary. 72 is OK. Competing bacteria sometimes work for pathogen control and sometimes don't. If you were using inorganic nutes, you could use H2O2, which does work, every time.

You're on municipal tapwater? Organic nutes can be challenging. You can't use H2O2 to control pathogens- and you would be very surprised how quickly a nute tank can build up a pathogen load. Chlorination in muni tapwater will keep a tank fairly clean for about 3-4 days- after that, pathogens...

No need for the water level to touch the roots. The mist from the bubbles breaking the surface is plenty of water for the roots- that's the whole point of aero. However, you may later find your roots will grow down into the water. That's OK as long as the aeration is continuous. You get DWC...

It's nice to have a pound just sittin' around. ;)

It's overwatering. If this is a DWC or aero system, there's no need for the water level to touch the pellets, the airstone/bubble curtain will make the rootzone humid enough. Do yourself a big favour & replace the LEDs with a suitably sized HPS for your growing area.

pH bumping up is usually a reliable indicator of pathogens (pythium, fusarium) in the rootmass. Treat the res with 50% grade H2O2 at 1ml/L every 3-4 days. Aeration can cause the pH to drift up but usually no more than .1-.2 every few days. A .5-1.0 jump overnight is probably pathogens.

5 litres per plant.