Runoff pH still climbing!

Hey, your plants are looking very healthy and this is not something I think you should be worrying yourself about. I have listed some pints below that I feel will help clarify any uncertainty. Flushing in soil is a big no no for me, soils can become super saturated and compacted that will lead to root rot and other major issues, I would skip a few feedings if you feel there are to many nutrients in the medium and let the plant soak it up naturally. More about the PH below, Stems can turn red/pink for many reasons and LED lights is one of them. My last few grows all my plants did this and they turned out just fine at the end of it all. As for soil PH, if you are indeed in soil. it will buffer itself quite well as that's what soil does best, so your runoff will not match your incoming but it is changing the medium in terms of nutrients and microorganisms. Given that your medium is mainly organic materials a PH of anything under 6.2 is not the best for it, and should be aiming for 6.2-6.5 going in. Given that you have fortified the medium with calcium it will be neutralizing the acids and bring it back to an equilibrium. To add to this I find that the type of meter your using is subject to a lot of errors and discrepancy, I would get some litmus paper as a backup or a proper digital PH pen if your budget allows for it. In the end 6.8 is still very reasonible for soil and your plants are looking A+ Good Luck & Happy Growing! ***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details: growdiaries.com/giveaways/GotM-August-2022 Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***

I would be tempted to follow the advice from @growinggrannie. If your medium is soil then you shouldn't be watering with such low pH. I get your trying to lower your soil ph but it could cause ph lock outs. So if its soil put 3 times the amount of water through the soil, catch samples of runoff periodically while your doing it. Before you put the last bit of water through your runoff ph should be in range. Aim for ph 6.2 with the water going through.

Looking at your diary, seeing what you're trying to accomplish, I think you're going to have to do a couple of things: first is to do a hard flush which, given that you're growing in 3gallon pots, means running 9 gallons of pH'd water through each pot (keep checking your runoff - it'll come down). The second thing you're going to need to do is to cut the amount of BioGrow you're giving her... this has too much nitrogen in it for plants in the flowering stage, especially at the rate you're feeding it... An excess of nitrogen will cause a lockout of other vital nutrients resulting in the red stems and the yellowing/discoloration in the leaves. It means that no matter how much calmag you give your plants, they're unable to absorb it - pH also has a lot to do with how or IF the plant can absorb the crucial nutrients as well - aim for a range of 6.0-6.5 in soil... Once you've flushed, the first feeding (after she's dried out) should be 1/2 strength. Good luck! Looks like a really nice harvest is in your future!!