The invention relates to systems and methods for controlling salt concentration in a brine solution using a liquid potassium phosphate composition. In an embodiment, the invention includes a method for operating a meat product processing machine including removing a diluted brine solution from a reservoir, and adding a liquid composition comprising greater than about 50 wt. % of a potassium phosphate salt to the reservoir. In an embodiment, the invention includes a method for processing meat products. In an embodiment, the invention includes a method for treating meat products. In an embodiment, the invention includes a method for automatically controlling salt concentrations in a meat processing reservoir. In an embodiment, the invention includes a method for maintaining the concentration of a brine solution used in meat processing.