This our first pool season. We had a pool slide that had been backordered installed on Friday and attempted to heat the pool to use it once before closing on Tuesday. Our Jandy gas heater has shorted x 2 already this first season and it happened again Friday night. The other times we were able to get the rest of the equipment working while we waited for heater repair. This time the breaker is tripped and won't go all the way back. I'm in IN and temps overnight tonight are supposed to be in the mid 20's. How worried do I need to be about freezing? I think the underground pipes will be ok, but I'm worried about the equipment pad. I also need advice about pre-closing chemicals. Chlorine level is about 7 right now. I was planning to raise it to slam level yesterday and then add polyquat tomorrow. We don't have a robot vacuum. We were also planning to vacuum this weekend and can't do that either! Help!