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I've heard a rumor that PPM levels in an aero setup should stay approximately the same over time. If the ppm levels rise or fall, this mean the target value is off. If your ppm levels are rising, this means that the plants are sucking up more water than nutrients, and the target ppm level should be decreased. If the ppm levels are falling, this means the plants are sucking up more nutrients than water, and your target ppm level should be increased. I thought about this a great deal, but...
Targeting nutrient (ppm) levels in Aero/Hydro system
Targeting nutrient (ppm) levels in Aero/Hydro system
from Hydroponics / Aeroponics
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