I'm doing a DIY pool and bought a kit online but I have a pool builder that's helping me out along the way. My question is when I was deciding on pool walls the manufacturer wanted me to use polymer but the pool builder said galvanized steel all the way because its stronger and it's what he preferred. I didn't The manufacturer came back and said since I was using salt water they recommended the polymer so I asked my pool builder and he said he's done pools for 20 years and never seen an issue so I went with the galvanized steel and I'm halfway through the install. This is concerning me because every pool manufacturer website I look at says no salt with metal walls is this true?