The Staple Fiber Unit at Hsinpu Chemical Fiber Plant installed a new recycling tank in 2020 and modified the pipes. The overflow pipe and discharge pipe from the water tray for the rollers of stretching machine DS 1 are connected to the recycling tank to control water quality and wastewater quantity during production. In the past, the water tank requires approximately 170 kL of water a day. The modification reduced the water consumed to 128 kL a day, saving 42 kL daily, and approximately NT$710,000 a year.