The present invention discloses an integrated desalination and salt plant for the production of a salt or slurry product of high purity. The reject stream from the desalination plant is used as the feed stream for the salt plant. The salt plant feed stream is filtered to effectively remove sulfate, which prevents scale formation in the salt plant equipment. The filtering may also reduce the level of calcium, magnesium, bicarbonate, or other components of the feed which may also prevent scale formation in the salt plant equipment. The salt plant produces a high purity salt product without the use of chemical purification.