you dont want your system to be off for 12 hours.. The roots DO chill in the water, and it does need to be oxygenated.. keeping the sprayers on is what oxygenates the water in which the roots rest.. im not sure if keeping the sprayers on 24/7 will be bad. the only downside to keeping it pumping 24 hours is that the pump MAY get a lil hot and heat up your nutrient solution. and maybe clog up your microsprayers sooner..
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