Conducting hands-on experiments plays a crucial role in students’ understanding of scientific principles. However, the lack of laboratories and appropriate equipment in secondary schools limits this opportunity. This project aims to respond to this problem by focusing on a concrete application: the improvement of the coagulation – decantation process of MES in the treatment of wastewater. Using local plants (okra and aloe vera) as natural. This research explores environmentally friendly and cost-effective solutions for water treatment, while providing students with an opportunity for hands-on learning and technical skills development.