Galvanized steel has almost no protection against continuous contact with salt water. There aren't even any stainless steels that I know of that can handle it w

Galvanized steel has almost no protection against continuous contact with salt water. There aren't even any stainless steels that I know of that can handle it well (just varying levels of resistance). I would say if you absolutely need a metal, you'd need marine grade stainless as well as a strong protective coating that you need to repaint on a regular basis, or possibly aluminum (as long as it's not going to have impacts or stresses that could bend it repeatedly). If it were me, and it really is low tech and not mission critical, I'd probably use wood, fiberglass, or PVC.