use this as a ppm guide --
Seedlings: 100-ppm
First Half of Vegging Cycle: 300-ppm
Second Half of Vegging: 450-ppm
First Half of Flowering: 750-ppm
Second Half of Flowering: 1000-ppm
End of Flower, As close to 0 as possible
use half these values for rdwc , when starting new strains , and then raise it or lower as need be (ppm goes down more food , ppm goes up less food.) , so for a rdwc 250w hps drop these values by 2/3 and slowly raise or lower as you need , remember less is more in dwc
like