Please forgive me in advanced…im still new to growing and still learning a lot.
With that said, I am doing a coco-coir based grow, where I have a reservoir mixed with my nutrients, and a couple air stones. Whenever I brew the solution, I tend to set the pH to 5.5 - 5.7. The problem I’m having is that the longer I let the solution sit, the higher the pH gets. I let it sit out for a few days (Was letting the coco dry up) and the pH jumped to 6.7. Any ideas why this would be happening? My plants don’t seem to have any deficiencies (Besides the salty fabric pots) thus far.