Definitely do not use your SWC to shock the pool. It runs the cell at 100% power for 24 hours...and shortens the lifespan of the cell. If I need to shock (which I haven't since I got the SWC) I would just use bleach.

Easy test to see if there's baq in there still. Slug a gallon of bleach in the pool. If it turns green, it's still in there!

On second thought, maybe not. That'll start a mess that you have to clean up right then and there. Go to the baquacil forum and read up on what has to be done. There's a good post in there that outlines what needs to be done.

Michael