Thanks, Carl. Silly me, I was trying to get pH higher for closing. Easy fix. I set it aerating last night and I can't get over there to stop it until hubby wakes up.

I will bump the FC up higher. The liner can't get too much worse. In a bunch of places you can even see where the former owners dumped in bags of "shock" and let it sit. When I first saw them, I thought some of your white-sand/snow had come to Illinois!

Incoming piping is all PVC. Detergent it is if the o-ring doesn't take care of it. I closed the skimmer valve a tad and it was still holding 2 hours later.