Building a pool ten miles from the Atlantic is a different project than building one in the Piedmont. The soil is sand, not clay. The water table sits close to the surface and rises during storm season. A pool contractor who works on the coast understands that these are not secondary concerns. They are the primary engineering constraints. Every decision about the shell type, the equipment, the decking, the plumbing, and the surrounding landscape needs to account for the environment the pool will live in for the next thirty years.