Abstract: An apparatus is disclosed for dissolving salt in an undersaturated brine to bring the brine up to saturation conditions. A salt slurry, specifically sodium chloride, is brought into a holding tank and recycled to keep the solids suspended in the liquid. Part of the recycling salt stream is diverted to a saturator unit consisting of an upright column and a slurry feed tube mounted inside and coaxial with the column. The slurry passes downwardly through the feed tube and mixes with an undersaturated brine stream entering through the bottom of the column. This mixture flows upwardly through an annulus section defined between the feed tube and saturator column, with the salt dissolving in the brine during the upward flow. Saturated brine is removed at the top of the column for ultimate use, such as in chlorine cells.