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04-11-2007, 12:21 AM #6OPMember
i dont understand testing runoff ppm
[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.
QUOTE]
this is definitely the case. tyvm rhiz. tonight i'll try another method to see if its still off.
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