I've got a fountain out front that's waiting for an electrical connection. I plan on taping power off a GFCI duplex recepticle in the garage, running 15 feet of conduit and installing an outdoor duplex GFCI recepticle on the exterior of the garage. I'll install a standard switch between them. I understand GFCIs are required for any outdoor application. My question is, will it be a problem connecting two GFCI recepticles in series?