Fomerballer
Well-Known Member
I use a ppm meter(cheap on amazon). My tap h20 is around 375 so first 2weeks my grow added at 200 ppm. Then 4 weeks I go to 400 ppm then 6 weeks 600ppm. I add about 150ppm calmag at 4 weeks till done. I use hydroguard 1 lid per gallon. I had good luck with northern lights.