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Purpose of this research was to determine a capability of MSL-sand in reducing contaminants out of the liquid waste of CPO; to determine optimal rate of flow and; to determine the efficiency of MSL-sand in reducing oil-fat, BOD, COD and pH of liquid waste of CPO.  The research was done by flowing liquid waste through an MSL-sand with a rate of flow were0.3 L/hour, 0.6 L/hour, 0.9 L/hour, and 1.2 L/hour; each of treatment was repeated three times. Result of the research showed that with rate of flow of 0.3 L/hour, 0.6 L/hour, 0.9 L/hour, and 1.2 L/hour, the MSL-sand was capable of reducing oil-fat from 471.6 mg/L to 21.30 mg/L , 33.40 mg/L , 43.47 mg/L , and 55.30 mg/L respectively;B OD from 412 mg/Lto 6.73 mg/L ,19.27 mg/L ,33.10 mg/L , and46.93 mg/L respectively;C OD from 1237 mg/L to  31.33 mg/L , 61.67 mg/L , 98.33 mg/L , and135.00 mg/L respectively; an d pH from 9.00to 6.72,6.88,7.21 and7.36 respectively.  The optimal rate of flow to reduce liquid waste contaminant was 0.3 L/jam (class III) and 0.4 L/jam (class IV) . Efficiency of the MSL -sand with the rate of flow of 0 . 3 L/jam , 0 .6 L/jam , 0 .9 L/jam , dan 1 . 2 L/jam in reducing oil-fat was 95.48 %, 92.92 %, 90.78 %, and88.27 % out of 47 1.6 mg/L ; COD was  97.47 %, 95.01 %,92.05 %, and89.06 % out of 1 2 3 7 mg/L ; and BOD was98.37 %, 95.32 %, 91.97 %, and88.61 %out of 412 mg/L . Reduce of contaminant out of the liquid waste of CPO proved that MSL-sand was capable of reducing oil-fat , COD an d BOD and also neutralize the pH .

USE OF SAND AS A COMPONENT OF MULTI SOIL LAYERING (MSL) SYSTEM TO MINIMIZE LIQUID WASTE CONTAMINANT OF CRUDE PALM OIL (CPO)