Ph and ec

How is your PH getting that low. If it's from the run-off then it's simple. That isn't a true reading. If you aren't making a mix then say add too much of one nute over another, say 100ml of 1 300ml of another well, the PH of that 300ml will effect the PH/PPM of the other reading, only real results that you can count on from run-off if is when being applied they are all mixed and after that pour to the tests. And I'd flush your sub after a few days of feeds to get the salts out and avoid nute lockout. If you read my PPM for my zkittlez hydro it was 8500 and I thought that had to be wrong, but my friends much better PPM gave 8550. And no way was I giving them that the highest was 1400 it was a thing of me not changing the run-off for over 2 weeks and roots were drinking from the plate but clearly there was nute lockout and was only taking up mostly water, I'm putting this down to some advice I got to add a higher PPM and I broke my routine of just adding my mix and too much of 2 nutes locked out my whole mix, I just caught it in time. As my plant was starting to get very light green and starting showing slight signs of 'the claw"