[quote=rhizome] if you are measuring the first few drops of return, I would expect a higher concentration. In this case, if average res EC was relatively constant, it wouldn't concern me much.

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this is definitely the case. tyvm rhiz. tonight i'll try another method to see if its still off.
dank4life Reviewed by dank4life on . i dont understand testing runoff ppm i dont get how it works. i know theres some correlation between runoff ppm and res ppm. but which way does the osmosis go? im reading 1250 at the res but 1330 runoff. is that bad? Rating: 5