ScaleSim has been developed and continuously improved over the last 25 year. Today it is a state-of-the-art scale prediction software that combines a full water chemistry model with a full PVT model to simulate chemistry and phase equilibria in oil-gas-water systems. ScaleSim can predict the scale potential and amount of salt for all the common scale types found in oil and gas wells over a wide range of temperature, pressure, water compositions and oil/gas compositions.