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Put the 1000s in cooltubes. You can run 2x1000 in a single duct line. Source & dump air for the cooltubes outside the grow room. Instead of continuing this line of inquiry in this thread, please take it over here: https://www.rollitup.org/hydroponics-aeroponics/399206-its-fuct-world.html

When I wrote the '2 weeks' thread, I misjudged the size of the trays I have. You'll find some errata notes in the first page of that thread if you go look. My trays are actually 900mmx900mm (35.4" x 35.4"), a bit smaller than 4'x4'. But yes, I'm using 2x 1000 over the 4x 900x900mm trays.

Yeah. All that. I DO believe that high intensity LED technology will eventually come along that will make growing plants with them a functional possibility, but the limitation right now is the thermal dissipation of the LED semiconductor junction into the substrate. Serious LEDs like Luxeons...

Ah, OK, gotcha. You're one of the few ppl who actually do need Cal-Mag or equivalent Ca & Mg supplementation. Heh, thanks. :)

I think you should get a better idea of that aircon unit's current draw- best thing you can do is buy a plug-in kWh meter, something like this one. Betting you can find them more cheaply than listed, at general electronics stores. Most devices like this will measure both peak and continuous...

Wow! Thanks. :) Bewdy, you can do quite a lot with 72 plants. Wish I could say the same. Anything over 5 plants in my locality is a 'large commercial quanitity' and could get me 20 years. I blame the drugs. :D 35% will do as long as doesn't have any stabilisers added. I'm...

You're going to wind up with HUGE plants if you veg for 8 weeks then flower. They'll wind up so tall that most of the bud mass will be well & truly out of the highest intensity pattern of HID lighting. Much of what you'll get will be small, fluffy buds with a lot of leaf. Do you have some...

Were I you, I'd get a water analysis from a county extension agency or a nearby university. TDS readings as high as yours could be caused by high salinity. Distillation/RO is a good option if you're stuck with well/bore water with excessive salinity (>500ppm).

Not much, really. Totally unnecessary. Leave it uncovered. H2O2 is commonly used in hydroponics as a nute solution steriliser and root oxygenator. In conjunction with inorganic nutes, it's a surefire way to keep rootmasses free of disease and promote root development. Cutting...

hmm, ok hmm, ok again... Why are you using RO?

Don't use the 'zymes' additive. The 'jelly snot' is a mass of pathogens- bacteria, fungi, etc. Dump the tank, clean the tank & airstone. Mix a new tank of nutes with 50% grade H2O2 at 10ml/L. In 3-4 days, dose the tank with 1ml/L 50% grade H2O2 and keep doing so every 3-4 days. Fixed. :)

What? The wisecrack I made about full-tilt homeopathic kooks a couple of pages back which was much snarkier. :D

Something happened that likely wasn't related to the H2O2. Just can't imagine such a low dose of H2O2 doing anything harmful. Good deal.

Yep, agreed. Noice pic, Geeb.

Hay Geeb, good to hear from you. Hope everything's normal for you. :) I'm not a fan of light movers at all. If you think you need a light mover, you either need more lights or need to be less ambitious with the amount of area you're trying to light. I don't think I'd use a 600 on an area...

H2O2 will break down organic compounds into the component elements; CaCl2 itself isn't an organic compound, though. Pretty good for melting ice on roadways. Why do you think you need a Ca supplement, anyway?

How many ml in a "drop"? Applying H2O2 directly to a rez where roots are in the solution could have been part of the problem, but this much I'll tell ya- 2.5ml/gal of 35% is about half the efficacious rate for sterilising solutions and would have barely had an effect on microbes, let...

5ml/L is not 7ml/L. The dosage I'm suggesting is really quite low- and you're independently electing to take it lower. You're on your own.

Chlorine at the levels applied by municipal water treatment plants is harmless to plants and people.

Thanks. :) Yes, it'll both reduce pathogens and oxygenate the roots. Presuming you're doing a DWC? Water loses dissolved oxygen as it gets warmer, but H2O2 and an airstone will help. .5ml/gal is way too little. For 29% H2O2, it should be about 7ml/gal, reapplied every 3-4 days. With...