This is one thing I still buy from a pool store for two reasons. It is a bit more expensive (about $0.25/gal), but I need fewer jugs because it is 12%. That is much more convenient for me. The bottles also pour much nicer, and are naturally recycled. Plus they sell muriatic acid that is a lot stronger than home depot (the home depot acid dropped in strength about 2 years ago, but not in price), so I pick it all up at one time.

The pool store also claims their chlorine is "fresher" than bleach or home depot chlorine. I'm skeptical on this, any thoughts?