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Now that I discovered it, it seems pretty obvious .... When you put in buffers to bring you PH up or down, this effects ppms. It can add 100 or more ppm to your solution, which it did to me this morning. I was trying to adjust my DWC for a low ph condition. I needed to add 3 L to my...

Im not too concerned as this condition is only on a couple of the leaves. Newest leaves seem fine. Just wondering what those pale green areas are caused by. DWC, PH fine, 700 ppm, week into flowering Thanks!