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So without a ppm meter I will never know if my ratios are right? Or will I just have to keep following the schedule, hoping it stays right. The plants haven't shown any signs of underfeeding or deficiency

But how do I measure parts per millions (PPM)? I'm using Dyna-Grow and I'm following their nute schedule. http://www.dyna-gro.com/Website%20pdf%20Files/DG%20Hydroponic%20Feeding%20Chart.pdf Also, I don't PH my run-off.

Alright, so I'm into week 4 of flower with my plants. They look great so far, no problems. I'm feeding Dyna-Gro Bloom, Pro-Tekt, and Mag-Pro, and sometimes a little Gaia juice. My question is how do I keep my NPK ratios where they should be? I know what they stand for, (Nitrogen, Phosphorous...