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I'm running a one plant cooler dwc with a res of about 4 gal. Definitely light tight. Lucas Formula 8:16 at ppm~820 (I use RO water); res temp 65-69ºF. My pH keeps dropping and I'm not sure why. I've been keeping it in check with some pH up but I'm wondering whats going on.... I've...

Hi RIU , I've been reading/learning a lot and finally took a stab at my own medical grow. Planning to do a SCROG. Here's the set-up for the mendo purps clone I brought home last night: 2' x 4' x 5' tall tent 250w HPS light 4" 65 cfm inlet fan 6" ~150 cfm exhaust fan (got it from a friend so...

I've been reading a lot here on rollitup and have my first question: I'm starting a medical grow next month and planning to go DWC, but the water in my city is hard. Apparently extremely hard--its listed at 1000ppm according to this water quality report from 2004: Does this mean I have...