Saltwater pools have become the default choice for a lot of new builds because they're gentler on skin and eyes than traditional chlorine systems. But "gentler on people" doesn't mean gentler on materials — saltwater systems generate chlorine through electrolysis, and the salt itself is corrosive to certain materials over time in ways traditional chlorine pools aren't.
Why saltwater changes the material equation
A saltwater pool typically runs 3,000 to 6,000 ppm of dissolved salt — noticeably salty, more than most people expect. That salt content, combined with the chlorine generated at the salt cell, is harder on metal fixtures, some grouts, and lower-quality or unsealed natural stone than standard chlorinated water.
Tile materials that hold up well
Porcelain
Porcelain's extremely low water absorption makes it one of the most saltwater-resistant tile options available. It doesn't react with salt or absorb it into the material the way porous stone can.
Glass tile
Glass is non-porous and chemically inert, so it holds up extremely well in saltwater environments and won't etch, fade, or absorb salt over time.
Materials that need extra attention in saltwater
Natural stone
Travertine, limestone, and marble can still be used successfully in saltwater pools, but they need to be properly sealed and resealed more diligently than in a standard chlorine pool, since salt can accelerate wear on an under-maintained seal.
Grout
Standard cement-based grout is more porous than the tile itself and can be a weak point in saltwater environments. Using an epoxy grout, which is far less porous and more chemically resistant, is worth the extra cost specifically for saltwater pool applications.
What about metal trim and fixtures?
This isn't a tile issue, but it's worth mentioning: any metal ladder rails, light fixtures, or hardware near a saltwater pool should be rated specifically for saltwater use. Standard stainless steel can still corrode over time in a saltwater environment if it's not the right grade.
The short version
Porcelain and glass tile are close to zero-worry choices for saltwater pools. Natural stone works well too, but leans more heavily on proper sealing and maintenance discipline than it would in a standard chlorine pool — not a reason to avoid it, just something to budget time and attention for.