I'm using 4x4x4in gro blocks I fertigated with your schedule....it came up 500ppm....should I run 300ppm of just seakelp till run off...to push some of the Mc out?
no don't flush with anything other than 50% strength nutrient mix of what you are running now. Fictitious Example: week 4 veg is 600PPM then if you need to flush just add water to that until it is 300PPM and flush with that. You only need to do that if you are not getting proper run-off volume. I don't measure run-off PPM or PH- ever. I do measure the volume. if you are getting 20% run-off every day don't worry about run-off PPM just inputs PPM and PH.
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