Soil Runoff PH/PPM ? ? ?

After doing some research, I realized PH and PPM are really important things to look at when problems arise.

So today i decided to measure the ph and ppm of my runoff water. and funny enough, the ppm's off my two badly nute burned plants were at 2000.


What should i get the ppm of the Runoff Water to before adding nutes again?
 
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