About your runoff question...
You need to run 2x the volume of your container before you measure your EC or PPM runoff
Meaning.. if you have a 3 gal pot you cannot run 1 gal through it and get an accurate measure of the runoff... you need to run 3-6 (closer to 6) to get an accurate measure of your runoff...
I have played with this ALOT when I am flushing my plants due to the fact I try to get under 200 ppm run off with 10 days to go at the end...
Hope this is helpful
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