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Experiments were performed to determine the amount of TS, TSS, VS, VSS, COD, TKN, organic- N, total-P, organic-P, and total- K that can be removed from liquid swine manure by settling for 60 minutes. The experiments were conducted using manure samples taken from buildings on three different swine farms. All experiments were replicated 3 times. The swine farms included two pitrecharge manure-handling systems and one flush facility. Significant regression equations were developed from the data that allow the prediction of solids and nutrient content of the influent and effluent manure and removal efficiencies over a TS range of 1730 to 23,850 mg/L. The effects of primary treatment on the ratio of available N to P2O5 in the effluent and the impact on the design of further treatment processes will be discussed. These data provide needed information to allow engineers to more precisely design gravity settling structures for primary treatment of swine manure.