Thanks so much for all your help!

I think there is still a plug in the bottom of the skimmer, as I tried to vacuum (using the plate that goes over the top of the skimmer) and there was no suction at all. Is it possible that there is a plug in the bottom of the skimmer, and if so, how in the heck do I get it out? I tried to screw the gizmo bottle back in (stop laughing!), and of course, that's next to impossible to do with water in the skimmer. Any ideas?