newbie2715,

I have some questions about your pool since I'm trying to figure out when corrosion occurs. Since it's an indoor pool, is there any Cyanuric Acid (CYA) in the pool? Most indoor pools do not have CYA because there is no sunlight, but having chlorine without CYA makes the chlorine far stronger in concentration and potentially corrosive. What is your source of chlorine (bleach, Trichlor, SWG)? What is your typical Free Chlorine (FC) level?

Also, when you remove the screws, look at the screw mounts and see if you can tell if they are made of the same material as the screws.

Thanks,
Richard