Proper Time To Check PPM Runoff?

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When hand watering in coco, when is the best or most accurate point to check ppm? It seems that if checked when coming directly out of the pot, the solution is the same or very close to what is put in...If you check when the spill tray is tilted a bit or when it fills up just enough to activate the meter, it goes up from the initial reading. And, if you let the pot drain completely is goes up even more. The later seems as though it would have some kind of contamination from left over salts etc.

What say ye?

Thanks for the input!!!

G
 
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I have it on good authority its not worth bothering to read run off ppm as its not accurate. Just be sure what you are putting in is correct and you should reach harvest.
Good luck
EP3
 
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