I searched and found a few posts on this, but nothing definitive. It will be bloody cold here before long, but as I get ready to close the pool (for the first time...) I (or, more accurately, my wife) am interested in keeping the spa open for at least a few months. I can isolate the spa plumbing and blow out just the pool lines when I close. My home-brew automation will allow me to run the filter pump on low speed and keep the heater at a minimum setting so the spa/filter/pipes don't freeze when not in use. Of course, I would get an insulated spa cover. And I would be manually sanitizing instead of relying on my SWG. The power is pretty reliable here, so I'm not too concerned about outages. Am I crazy? Will this work?