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Canoed leaves are usually a condition of high wind, high heat, low moisture and/or high EC. Also stressed plants do better in a milder climate. Things you can do to alleviate issues.... Raise light and/or add a diffuser, HPS puts out lots of IR that will heat leaves over tent temps. Lower...

Don't be a hatin' on me.....somebody was gonna post it eventually. :P

If you look through some of the outdoor grow threads, there are some nice framed grows using wire mesh.

Grabbed a sleeve of acrylic coin holders, should make nice containers for some easy grab and go hash.

Quite a few people omit the epsom from Jack's now, I skipped it during a four month outdoor run and had no issues.

My guess to what is happening is all the moisture from the combustion and the slightly damp warm air around the burner are getting sucked up by the damper and exhausted out of the basement. The only thing left is the cold dry air in the rest of the basement.

My main battle during winter basement grows is humidity. The furnace sucks all the humidity out of the area. Not uncommon for the area right around the furnace to be 12-15%RH

I have been able to smell my grow coming into the neighborhood, probably 500 ft away. This was in a fairly open area though. I would think the large number of trees would help some....but to what do degree is only a guess.

I was in peat mix, either Sunshine #4 or Berger BM6...I can't remember now. I usually watered once a day at around 1.4EC, during heatwaves I would water twice a day at 0.8 EC. Final pot size was 7 gallons.

Just run the main 3 part and use the rest to fertilize the lawn. I just harvested using Jacks and rainwater and the plant had green leaves right to the end.

Ballpark use for Calmag is 0.3-0.4 EC. If you start with RO, find the dose that brings water to 0.3 EC, then add your required nutes. Different brands will have different concentrations, so going by EC is your best bet.

If you like growing and 3d printing, check out Hoocho.

....and what's your take on it so far compared to sodium/potassium filters?

I keep a HPS around for winter grows. The direct IR helps alot even in cold rooms.

Most people use phosphoric acid as pH down. The small amounts needed to adjust water won't have much effect on the plant. In the end you're just upping the phosphate in the water by a few ppm.

20,000 hours.

I always liked Espoma, cheap, no BS and works well. I would mix 50/50 with EWC or compost and top dress.

Plants look to be in a light mix with lots of perlite. They aren't sitting in water or being watered too much. Only thing I can think of is, are they directly on a cold concrete floor? Took me a while to figure out why I was getting tons or purple deficient growth years ago. After I added...

Looks like classic overwatered plants. I would get the growbags off the bottom of the saucer with same raised grating. You can also drain runoff from the saucer with a small transfer pump.