Hi, using Pro-mix soiless medium, A/N at 3/4 strength, (which tests out at 5.7/5.8 pH before watering) but my medium run-off is always 6.5 range?? Soil probe says it's even higher, but it's a cheap probe (have ordered a better one)
I tested various pH level (non-nute, R/O) water through my raw...