Biocoagulant is a natural coagulant from organism like seeds. Proteins in biocoagulants act as coagulant agents in coagulation. In this research, biocoagulant were made from rubber seeds extracted using aqua DM for 2 minutes at room temperature (25 ± 2°C), and dried under the sun. Coagulation using Jar floc test was done in various conditions, such as variation of dosage of biocoagulant (0,50…