The pool did fine with a Saturday/Wednesday only to run the pumps. We're about to have a week or more of nasty weather with lows in the low 20's and daytime highs in the mid to upper 30's, so not really a hard freeze. To be safe I took the drain plugs out of the pumps, opened the pump basket and set the multi-port valve to an intermediate setting so it's open to air. Today I just dribbled some bleach around the edge and used the leafnet to stir the water. I'm betting this will work for several weeks.