@WeedDoctorSam, I've got a little chiller that has a pump circulating the nutrients through some clear pvc tubing. To drain my tank all im really doing is interrupting the flow from the chiller back into the tank by pulling the return line from the chiller out of the top of the tank and placing it in the blue bag to drain. I usually wait until my tank is less than half full when I drain it as it's less effort (less water to pump out, move and dispose of) and less wasteful also (there are still unused nutrients in there)
When I can see air bubbles running through the chiller lines and the flow has slowed down significantly, I take the chiller return line (clear pvc tubing) out of the blue bag and place it back into the top of my tank, then I pump in my fresh batch of nutrients and im good to go for a few days
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