Thanks in advance for your feedback....
I decided to try keeping the pool active through the winter months. So far everything's been working well.
Here in Fuquay Varina NC - we lost power last night for around 8 - 9 hours on the coldest night of the year.... (figures).
I've got a mylar "survival" blanket draped around the the filter and return pipes, with a larger tarp covering that, and the rest of the pad.
I've been running the pump when it gets near or below freezing, and have been keeping a light going under the tarp. I haven't had any trouble until last night - single digit temps and a power failure for approximately 8 hours. We got the power back and I uncovered to check everything. The pool has no icing at all, but there was a tiny bit of slush starting to form in the top of the pump filter, and the salt cell. This all cleared when I restarted the pump.
My pressure gauge on the filter showed 0 for awhile, and last time I checked was at 45!. Everything seems to be functioning well. No odd noises, no leaks in any piping, all jets are working with no problem.
Should I be concerned about the pressure? I'm thinking the gauge is suffering from the cold. Tonight is another cold one, and I've replaced the incandescent light with a worklight that throws serious heat.
After tonight we're back to normal - 40 -60 during the day and 30's and above at night.
Other than a few leaves - the pool looks swimmable....