For now, I would try bringing it down with apple cider vinegar instead of your pool chems, and see if you can pick up proper plant chems asap. Cider vinegar isn't the IDEAL pH down, but as emergency pH adjustments go, you can do a lot worse, and there is something in it that the soil microbes acutally like- I'm not up on my mycos though so I can't explain it. lol.
What does the label on your pool chems say? I am interested in the actual chemical composition of them.
stinkyattic Reviewed by stinkyattic on . Help! - Yellowing leaves! Leaves started turning yellow starting at the edges about 24 hours ago. They have started showing slight yellowing on the edges and has quickly spread to most of the leaf. Conditions: Vegging under 4-42w CFL & 1-125w CFL. All are 6500k and about 2-4 inches from plant tops. Temps from 78-85 degrees, usually around 81. No ferts yet. Water is PH balanced to about 6.8 and plants are watered about every day. Currently in 4 inch pots for vegging. Soil was checked last week at around 6.7. Rating: 5