I just looked at the weather for today and the temps overnight are supposed to be freezing (low 30s) with frost advisory. My pool has been open for about 3 weeks and its been in the 40s-50s at night. Is there anything special I have to do? Run the filter all night or not at all? The water is all balanced and salt was adding yesterday. I was planning on setting up the SWG tonight but maybe I should wait until tomorrow for that? The temps are supposed to be close to 70s tomorrow. Also I was going to put on the solar cover today (even tho there is no sun) should I wait on that?