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Flushed the tanks and started over. Same problem except I noticed it goes down if I check it immediately but after about 30 mins if I check again its started to rise again... WTF?! I know our tap water has high Chlorine, could this cause the problem? OR could it be my nutrients?

Hey guys, This is my first grow, growing hydro. I moved the plants from soil to hydro last night after about 3 weeks.(we were waiting for everything to ship in) and I couldn't get a PH test kit until today. I got a kit that had the vial and a little thing of PH up and PH down. Checked my tap...