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Well the soil probably has nutrients in it. So anything in there could show up in the run off. But the problem with trying to measure that in the runoff, is that nutrients that are in the soil react differently than nutrients that are in the bottle. Nutrients from the bottle are immediately available, but soil nutrients TEND to be a little slower releasing. Stop being worried about the PPM of the runoff. I have NEVER measured it, and never will.
-------------------- Dude she isn't as young as she use to be.