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Separation of shells and kernels in palm oil mill are divided into two separation processes, there are dry and wet separation processes. Dry separation process uses Light Transport Dry Separator (LTDS) using the pneumatic principle of fan suction. The wet separation process uses Claybath and Hydrocyclone. Separation using Claybath is based on the principle of density using a calcium carbonate solution medium. Separation with Hydocyclone uses the principle of centrifugal force with the help of a pump using water fluid media. The purpose of this study was to analyze the effectiveness of the separation between hydrocyclone and claybath based on dirt content and kernel loss, to determine the level of efficiency of use between hydrocyclone and claybath based on the use of CaCO3 and the cost of power used and evaluate the performance of combined use of hydrocyclone and claybath. The results showed that use of claybath in the wet separation process at the palm oil mill nut and kernel station was more effective than hydrocyclone and a combination of both (claybath + hydocylcone), with the percentage of impurities in claybath of 5.47%; kernel loss of 1.24% and use of CaCO3 3.99 kg / ton FFB. The used of claybath in the wet separation process at the palm oil mill nut and kernel station was more effective than hydrocyclone and a combination of both, with a percentage of impurities of 5.47%; kernel loss of 1.24% and used of CaCO3 3.99 kg / ton FFB. The used of claybath was more appropriate compared to the used of a combination of hydrocyclone and claybath in the wet separation process at the nut and kernel stations in palm oil mill.