Does anyone have a recommendation for a quality submersible pump? I have been renting a Wacker Nueson 2/3 hp from Home Depot, but at $29.00 per 4 hour rental, I would rather put the money toward something I own. I am looking at the Wayne, CDU 790 and it appears suitable to drain my 1800 gallon spa easily. I prefer to stay away from cheap plastic housings. Any thoughts?