Recently I bought some muriatic acid sold from the pool store. It was of course factory sealed and I assumed sealed especially well given its contents, and I stored it in a cupboard on its side since it fit well that way.
It leaked. Ok, I cleaned up the area and removed the now dissolved shelf and vowed not to store muriatic acid in any way except upright from now on.
A few weeks later I start noticing all my tools are rusted. I thought it was due to a succession of hurricanes giving us unusually wet weather. Then, when cleaning out my garage I noticed a bike wheel had the spokes clear rusted through and that rust seemed to be worst near the muriatic acid.
Then I got online and found this is a common problem and that even sealed and properly stored muriatic acid containers have been known to leak fumes and oxidize (rust!) everything in your garage. Luckily my damage wasn't too extensive, but I could see some very expensive repairs (cars?) due to this. I guess I could go to the pool store since it's their lousy product, but I doubt it would be worth the money -seems such a dangerous chemical should be well sealed.
I'm posting this as a cautionary tale. This is a topic I've never seen mentioned on troublefreepool.com and it never occurred to me this could happen. Maybe this could merit its own article in pool school.
I'm now storing my muriatic acid in a sealed plastic box outdoors.