You're only recirculating lake water—not paying for it. Why not just eliminate the nozzle and let the sump pump
run? BTW: Sump pumps are only OK. They're not all
that powerful.
My BIL draws lake water using a big bucket with a rope attached: eliminates any shock hazard beside the dock. As for myself, I've nearly completed a hot-water-only copper line to the dock. From experience of leaving a hose in direct sun, I know
not to use a metal nozzle!
