I know it's been a couple of months since you guys have posted in this thread but I wanted to add my two cents. I purchased a 5 gallon bucket of chlorine tablets for my pool about 1 month ago. The bucket was sealed, so I left it in my garage, next to my mountain bike, for about 3 weeks before moving it outdoors. When I got my bike out last night for a ride, the rear wheel was warped and I noticed I had two broken spokes. There appeared to be a rusting/ pitting on all the spokes right around the area that would have been right next to the lip of the 5 gallon bucket. I pulled my wheel off and headed to my local shop. On the way, with the wheel in the back, I hear an extremely loud pop. When I got to the shop (and yes, I purchase all my bikes and gear at local shops!) there were two additional broken spokes! Before I could say anything, the tech asked, "do you have a pool?"...exactly! So a word of warning, it happens fast and it happens even if you think the package is sealed. Had I been riding when they went......