Can you use a diving board with a salt water pool?

Yes and no. Most inground plaster, fiberglass, and vinyl pools are compatible BUT older pool equipment such as heaters with copper heat exchangers and some pool ladders and screws on skimmers and light niches might need to be upgraded to materials that won't readily corrode or be degraded. Newer pools usually have such equipment already but it is best to check. Also, some inground pools build with some types of natural local rock (often limestone in parts of Texas) have reported problems with salt pools so salt systems should not be used or the rock work will need to be sealed on a regular basis to help protect it. Many steel walled above ground pools also are not compatible with salt systems because of corrosion issues.