11Hick11
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So i decided to water with PPM at 558, PH 6.5. The runoff DOES have a low PH just like you suspected. Its Red/orange so 5 to 5.5 i would say.I would water to runoff with pH'd water and check when you next water. I suspect you have a buildup that has thrown your pH too low and inhibited K absorbtion. A flush would be the fix.