how well will this hot tub hold up exposed to salt air on the beach

Really, there is no specific concern about being near salt-air at the beach. The cover is marine-grade vinyl, the acrylic shell is extremely durable and the cabinet material is synthetic as well. ?Under the hood,? the various items are either sealed, plastic or built for all kinds of weather conditions. These hot tubs will be as durable as any in a beach environment.