Badchoice
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In my DWC setup I have a drain spout, so with this I take a 100ml test vile fill it twice dump back in and On the third fill I use that for testing PH EC and PPM, now when I open the lid and test from the top of the res I get different PH PPM and EC not big differences maybe a .1 or .2 on PH maybe 100 or so on PPM. So I’m curious which would be the better point to test for better precision?