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Although expensive, nothing works as well at controlling water temperatures as a water chiller. It is of critical importance for a healthy root zone that water temps stay between 66-68 deg. F. This does not mean that they can sometimes be hotter or colder than these temperatures. It is about consistently staying at 66-68 deg. F. At this temperature, the nutrient solution holds a good amount of oxygen, and nutrient absorption rates are still high enough for most plants. See Best Overall System for more info.
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