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thanks bubba! so maybe chlorine is the problem. i usualy feed them at about 2.0 ec during flowering(dont know that in ppm) my tap water is 0.4 ec. i allways mix my solution as directed on the lables, but maybe it got to strong due to evaporation. i change the whole solution every week, but even...

the first pic on my post shows the yellowing, check it out..im sure its not nitrogen, maybe overfeed, but it looks like salts to me. can anyone give me a diagnosis by looking at the picture?

thanks for the help guys! do we all agree the yellowing is due to salt build up? anyone think its something else?

Thanks for the quick reply Roseman. So flushing with Hard water is ok? or do you suggest i try something else?

hi im wondering if this is a toxic salt build up. these pictures were taken at week 8 1/2. HPS 600w, ebb and flow system, rockwool and expanded clay pellets. air temp 28 degrees celcius, humidity 48%. i use hard water from the tap at 0.4 EC. at 18 degrees celcius. General Hydroponics flora...