I don't.. if the power quites you aren't going to dump CO2 into the tank just the sump where it will be easy to disapate it, having said that I have shut off my reactor water and kept the CO2 running and the pressure wasn't enuf to put CO2 to the system and even if it was is your water return to the sump above the water? if so C)2 is just going into the stand not the tank.
just another power consumer that isn't needed for most people as far as I am concerned.
Steve
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