As is known, wastewater from screen printing industry needs to be treated thoroughly. Other characteristics of screen-printing industry wastewater are high levels of TSS, turbidity, and color, which can be solved through a coagulation-flocculation process. Tiger Shrimp shells contain chitosan, which can function as a natural coagulant. Hopefully, this research will reduce the number of Tiger Shrimp shells waste while reducing pollution from color and TSS.