The kinetics of crystallization and dissolution of barium sulfate seed crystals were investigated conductimetrically. Growth is characterized by an initial surge caused by secondary nucleation, followed by a rate that is proportional to the square of the supersaturation. Studies were made using seed material of differing morphology. Crystallization and dissolution were studied in the presence of potential phosphonate and polyphosphate scaling inhibitors. Data are shown in graphical and tabular form.