Another question. What do I do once temps go back to normal? Make sure drain plugs are nice and tight, and then just turn on the pump? Air gets flushed out? Some other process?
That filter drain plug needs to be REALLY tight, last time I did a breakdown I was surprised how tight I needed to make it. You'll need a large wrench.
You'll have to prime the pumps big time, assuming better weather when you start back up, I'd just use a hose directly into the filter and fill it up good. It may take several seconds to prime but then you're good to go.