Pilot-scale treatment systems were designed for studying the optimum conditions of recycling and reuse of treated wastewater for fishing net dyeing process. There were three main units in the treatment systems which were coagulation/flocculation, sand filtration, and carbon filtration. The quality of final product or recycled water needed to meet quality requirements to reuse in fishing net dyeing process. The objective of this research was to examine the optimum dose of coagulation dosage, flow rate, filtration rate, turbidity, and electro conductivity (EC).