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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.

It may be counterproductive depending on where you do it. Large massive colas will turn in blobs of mildew in the cold damp areas like NE and the Pacific NW. In a place like Arizona I wouldn't see a problem.

I grew a few small plants this year. Didn't have the patience to deal with growing 10ft unprotected monsters in the crap NE weather.

Correct, everything is divided by 2.5. The NPK, Calcium, Sulfur, Boron...etc.

The only thing that can go bad with soluble salts is precipitation. I would water them down with RO or distilled water. A less saturated solution will have less chance for fallout. I always remember a hockey puck at the bottom of DynaGro when I didn't use it fast enough.

You need to divide the weight of each element by the total weight of the salts used. A ballpark mix for a 55gal barrel would be 100-100-50. Total weight in grams for each is 19.5N-18P-38K-19Ca-5Mg-6.5S. Divide all elements by 250 for NPK and percentages of the salt mix. 8-7-15 7.5Ca 2Mg 2.5S

Organics are slow to break down and release nutrients. You may not see a difference by harvest time. Only thing that works immediately are soluble ferts like MaxiGro, Calcium Nitrate...etc. But that would not be an organic source of N.

I think you can run a little lower EC and be fine. I'm running 1.3 EC with rainwater and she is still very green with dense buds. Ballpark of my mix is 120-40-180 90Ca 50Mg 100S.

Looks like an aphid nymph.

Not any stronger than your average liquid. Dyna-Gro makes a strong liquid, but half of it falls out after a few months leaving a puck in the bottom.