I've got a 7 day vacation coming up in July and was wondering if I could bring the pool up to shock level, leave the solar cover in place, and place the winter cover over top of that. I just can't see how the solar cover will be enough to hold the chlorine level high enough for 7 days. My filter is running on a timer now. I have it set for 6 hours (3 blocks of 2hr runs), but should probably bump that up to 8 hours. The main reason for leaving the solar cover in place is just for convenience (so as not to have to fold it up and put it away somewhere).