I was wondering if one brand of chemicals are better than another. I've never gone anywhere but Leslies for pool supplies so I've never tried anything else, i.e. ordering over the Internet or going to The Great Escape, for example. Are there any brands that are low-quality that I should stay away from? How would I know? I've seen places cheaper than Leslies but I'm hesitant to try them. Any advice/suggestions? Thanks!