Hey guys. I just bought a ppm reader. I’m a little confused on how to use it, and measuring nutrients. I usually measure my nutrients my ml per gal. But after doing that and measuring the ppm after adding nutrients. The ppm was still under 400. So I added more to get to 500 ppm. I’m 6 weeks into flower. So my question is, what do I use to measure nutrients, the ppm or the bottle? Because according to my ppm I’ll be consuming more nutrients. Thanks for all you do.