Evaluation of fractions obtained by ultrafiltration of crude extract of common bean seed for their suitability for turbidity removal revealed that they were efficient in it although their coagulation activities were slightly lower that of crude extract. Obtained fractions brought reduced organic load into the water after the treatment in comparison to crude extract or even diminished it in comparison to blank. According to these results ultrafiltration appeared to be promising technique for processing crude extract of common bean seed in respect of its simplicity in comparison to multistep isolation and purification procedures