I've come across a pool that has issues with stainless steel wall panels rusting. Its a very old pool with a concrete bottom and stainless steel walls. At the joints between the walls, there is almost always an accumulation of rust. Someone suggested that it is happening because of the salt water. So I'm looking for someone to fill in the blanks for me on this one. I don't know much about how salt water reacts with stainless steel, but I have a feeling that someone on this forum might be able to help me out.
The only thing I've seen in my experience that might combat any corrosion to metals in the pool associated with salt water would be to add a zinc anode. I only slightly understand how a zinc anode works, so if someone wants to explain that to me as well, it would be greatly appreciated.
This isn't a pool that I have been taking care of regularly, so I really don't know anything about the water chemistry. Typically the owner had the company I work for open and close the pool, and I would usually do the initial vacuuming. So other than one visit per year, I have no idea what is being done to it.