This study investigated the production and distribution of re-refined salt (Jaejeyeom) in the Busan area during the early 20th century. By analyzing salt import statistics and comparing the production costs of traditional boiled salt (Jayeom) with the retail prices of re-refined salt, the study identified the economic conditions that supported the growth of the re-refined salt industry. Large quantities of imported sun-dried salt entered through Busan Port. Although additional processing and distribution costs were involved, re-refined salt maintained a price advantage, helping it gradually overcome Koreans’ initial reluctance to adopt it. The distribution of Busan’s re-refined salt was primarily focused on Gyeongsang-do and Hamgyeong-do. In Gyeongsang-do, Nakdong river transport played key roles, with major distribution points including Hadan and Sangju along the Nakdong main stream, and nearby tributary regions such as Namji, Changnyeong, Hapcheon, and Milyang. After the opening of the Gyeongbu Railway in 1905, a large amount of salt was also transported to Daegu and Gimcheon via rail, though salt from Incheon also spread widely in northern Gyeongsangnam-do. In Hamgyeong-do, major distribution centers included Wonsan, Hamheung, Seongjin, Cheongjin, and Unggi. Despite producing salt locally, these regions lacked enough supply to meet both coastal and inland demand. Their locations along regular shipping routes made them key hubs for distributing Busan’s re-refined salt.