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This is a great read regarding chlorination in commercial greenhouse solutions. If anyone didn't think fatman was correct, I suggest that you please read this paper. His .5 residual ppm is spot on as minimum, and suggested range is 1-3ppm for control...

I'm hoping Fatman is still around. I have been using Dutchmaster zone for some time, and have tried the bleach solution in the past with great results. My question to anyone/everyone is whether or not it is necessary to continue running zone when you add bleach to the reservoir? I read...