This was a great read. I just started my DWC and i am having issues with ppm. How do you start with a ppm of 0. After i adjust my ph to 5.8 my ppm is at 480 before i even add any dyna-grow. I am in first week sprout and my 2 leaves (not the round ones) tips turned yellow. My ph was 6.2 my ppm was 658 and my temp was 78. I changed everything last night to ph 5.8 temp 74 and ppm 480 with no dyna-grow.