EC of runoff in soil (conversation starter, not really a question)

[SoulDwella]

So now I'm thoroughly confused on measuring the EC of runoff. My tap water's PPM is 155. The PPM of one gallon of my nute water with 7ml DynaGrow Bloom (%70 percent of recommended dose) is 477. The PPM of my runoff is 829. I guess this means a salt build up?? Wouldn't the PPM's be higher after draining through dirt no matter what? The dirt itself will be dissolved in the run off, right?? I cant comprehend that its possible to have a runoff with less PPM's than the input solution after draining through dirt.

Is measuring the PPM's of runoff in soil even viable?

I'm utterly confused now. LOL

[JeffInCanada]

Hi SoulDwella Good question!! I wondering the same regarding testing the run-off through soil/ soil-less. I think the EC-PPM meter measures dissolved material in the run-off. So any dirt bits floating in your test sample shouldn't matter. Sound like you have a good handle on it. Keep doing reading as you go, maybe it will make sense eventually. If your meter is trustworthy it's good to trust the results.