I kept the extra one (cuz they come in a 2pack) on top of the freezer under my carport- rust city! I took care of it when I repainted the freezer & moved the spare bottle to the “go to he!!” Shed.Glad it has worked for you. Not what I would recommend to others. We have seen too many pics of stuff rusting near where acid is stored.
My tub is on a raised deck platform that sits about 2' high. It's up against the house and two sides are steps up, but there is a section that isn't a step with lattice covering the side... I may have an idea!I have a part of my deck that is next to my hot tub that is 10x10 foot section about 4' high. I build a storage area under it. I enclosed it with vertical 1 x 4 lumber and a solid roof on top so it does not leak. I keep everything in there - hot tub stuff, chair cushions in giant totes, corn hole boards, a cart with firewood for the pit, etc. Bleach sits on one side, along with other spa stuff. MA lives by itself on the other side of the enclosure. Both are in sealed jugs, and the enclosure itself it pretty free breathing. If the bleach and MA were to somehow get together, there are much bigger issues going to cause that.
My test kit lives in a tackle box inside the house.
My tub is on a raised deck platform that sits about 2' high. It's up against the house and two sides are steps up, but there is a section that isn't a step with lattice covering the side... I may have an idea!
I do think the problem comes from poorly capped bottlesMy Home Depot keeps the bottles on a metal shelf - with no rust. I suspect it is a matter of the cap being on tightly. It could also be that I use the "green" (weaker) stuff as well, its like 12% or so.
I also have a jug sitting in my pool shed. That shed has metal studs in it, and well as my lawn tractor. Neither the tractor or the studs near the jug are rusted. Other studs are because of water infiltration, but the one 3" away from the jug is just fine.
HCL acid vapor is denser than air, so it will settle, but then it should also not rise out of the storage container on its' own.