In previous studies, the use of mineral wools as an onsite-supporting media in water bodies showed satisfactory results in removing organic pollutants. However, the analytical method chosen is still very conventional. This study aims to model the removal of organic pollutants represented by the COD value to determine the mineral performance. The data used in this study are field scale data using two types of mineral wools, namely type I (density 80 kg/m3 and water retention 95%) and type II (density 120 kg/m3 and water retention 92%). There are form variations of mineral wool namely cubes and blocks on each type, which are placed respectively in segments 2, 4, 8, and 9, on the Cikapayang River. The modeling results show that the most optimal type of mineral wool to remove COD is type II mineral wool-cube form at segment 4 using the first order kinetics equation. The reaction coefficient (k) obtained is 0,5378/s, standard deviation value is 14,532 mg/L COD, and the coefficient of determination is 0,1025. The kinetics value of the reaction removal and equations obtained are used to make modeling in Matlab R2020b application to determine the dimensions of the mineral wool required to remove pollutants.