Ground Fault Circuit Interrupter. If you have any electrical device used in the water garden pool, it is VERY important that you check to see if the circuit where you plug into is protected with a GFCI (Ground Fault Circuit Interrupter). Do not confuse this with the standard circuit breakers we are all familiar with that is in our homes. This GFCI is designed to be used around water and moisture where electricity is most dangerous. GFCI are designed to sense a very small amount of electrical mismatch and react extremely quick in fractions of a second in cutting off the electricity. Thus, the reaction of the GFCI with electricity makes them very different than the familiar standard circuit breaker. Plug in pumps, lights, etc. for a safe experience. (2 pole, 125 VAC, 15 Amps, 60 Htz, 1875 Watts).