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i need to do this because when the power is off for a few hours, the bacteria dies in the pump, (but not in the tank) and if it comes on again the dead bacteria gets pumped into the tank and nemo and his mates die :( .. thnx for all your help peaple.

Hi, Im looking for some kind of switch for my water pump, that when there is a power cut or somthing like that, and the power goes back on, i want the pump remain off, i wish to switch it back on manualy if i can ? Does such a switch exsist ? thnx