Ok so I have read the closing an in ground pool thread and also have read some other threads on closing my in ground pool, however I do have a few questions. The last two years I have opened to a nice green swamp, which has been quickly resolved thanks to this forum, but I am trying to avoid that next spring. I am in Virginia where it does not get below freezing a lot. My usual closing duties include brushing and vacuuming the pool, draining to below the return jet, attempting to blow out the lines, plugging the lines, draining the filter, basket, and chlorinator, and adding bioguard arctic blue winter shock and algaecide according to directions. It worked for several years just fine, but recent years I am getting algae growth over the winter. The closing thread says to SLAM the pool for a few days to ensure no algae, which I will do this year and to add polyquat (not familiar with this product). Do you have to add antifreeze to the lines or is this just a precaution in colder areas? Also, should I test my water say in January to make sure my FC is still up? I have a mesh loop loc cover that always allows some debris in, but I have ordered the water tubes this year to keep it sealed. So if I test over the winter and the FC is down, if I add chlorine with the lines plugged how does the chlorine get mixed? Is bioguard arctic blue ok to use, or do I need other products? I also read that the water temp is best at 60 degrees or below when closing to help with algae growth, my pool is about 68 now, so I should probably wait for a bit? Thanks in advance for any replies.