4 grams and 2 grams
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Is it possible you are seeing some after math from those numbers?
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Totally agree, and always drifts up. Can’t be helped in RDWC tho, just part of the process.
Also the need for a timer if one does use a pump/wavemaker. A couple times a day for a few minutes, just to keep it fresh.
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I did wonder that, definitely crossed my mind. I did see some tip burn and edges. And backed it off. You think those problems would show 3 weeks later?
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That aspect always made me question DWC systems and the pH adjustments with a mature plant in there. 
lots of adjusting I’d imagine. At least with the rdwc you have a res to adjust seperately right?
I mean some problems can take weeks to show. Idk it’s hard to say. I like to trust the numbers, if they are on point, I feel like it’s environmental/root zone related. possibly a picky plant
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Well there’s a res, but it’s part of the re-circulatory system. So it’s one large bath that keeps pumping around. Anything behind a fill float would then be a separate, optional res that could be added to the system, or just a plumbed in water line. Size of res plays an important role in an RDWC for this reason. I’m running a very small res compared to some builds that use big totes. Large res’s come with large buffers, but also large waste when/if changeovers are done.
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Thanks for sharing some details! 
a lot of systems look like just a pump and a 5 gallon bucket that’s been modified. Always was curious how they manage those buckets.
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Sounds like my first DWC back in the '90’s. My tiny aquarium stone plugged up and I just dropped a little pump from some old tabletop water thing in the bucket with a hose to the surface and let it chop up any roots that grew into it. Things were pretty rough and tumble before the internet 
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Ahhh the old internet. I kinda miss that AOL, had free internet for years with their trial discs. lol. I dumpster dived my first computer. Out of 5 garbage pcs I was able to build one good one. Haha simpler times.
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A couple years ago I made a couple buckets for a hydro grow. The first grow with this was a RDWC. While it was successful, it was a pain constantly adjusting ph and nutrient level. Next I switched to simple drip system with a supply reservoir and a drain reservoir. This did help with the ph and nutrient changes.
During a grow one of buckets wouldn’t drain correctly, and would always fill to the over flow tube. Due to the constantly flooded clay stones, it was not long until root rot set in on that plant. Since I had a small tent that was empty at the time. I moved the plant after drilling several small holes through the bottom sides of the bucket, so that the bucket could drain to waste. After treatment for root rot the plant recovered, and made it to a harvest. After moving the plant, and getting it back on track. I simply watered this plant with a quart of Mills Nutrients each morning at the correct ph. Not much else was needed. This experience made me question why do we make hydroponics so damn complicated?
Here is a picture of the buckets that was used.
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I try to view the pH drift as a positive. I run with the idea that best uptake pH’s are slightly different for various nutrients, so I like to work with the natural drift and keep things in a 5.8-6.2 range.
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@Low @OGIncognito
The more I get thinking about it the affected areas are on the edge on the the tent or near the very edge, they aren’t in the hot spot of the light.
I do wonder if the wind is being funneled along the tent wall? I am running slightly lower humidity than I would normally because of the size and the foliage.
Either way I’v corrected the things that seemed most apparent and just hope it fixes it.
I got runoff to 5.8 790. Fingers crossed.
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Low has you covered. 4gram A/2gram B
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I think i should try this out. My tap ppm is 180. This would work for me also. Right now i get 1000 ppm with the recommended amounts from Jacks. Will the 4/2 be beneficial for my plants?
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I have some MKP and want to use it with Jacks 321 during flower. Is this 2 grams of part A ,B and Epsom salt with 1.3 of MKP? Or minus the Epsom because of MKP?
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Yes use all four ingredients. I remembered that this 321+MKP formula came from @Myfriendis410, I think.
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Thank you … i will adjust accordingly…
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When using MKP, mix ratio is 2-2-2-1.2 (MKP). Use at transition and up until day 21 of flower. Then revert back to the 3-2-1 formula. I also use silica through the entire grow.
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Thanks! Somehow I got 1.3 of MKP instead of 1.2, probably wouldn’t matter much though.
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I tried it after watching @AfgVet growing with this schedule. Part A already has magnesium and sulfur that Epsom would have provided 
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