Polyester geotextiles play a vital role in water conservancy projects due to their excellent filtration and drainage performance, effectively addressing the issue of easy failure in traditional sand and gravel filter layers. In the construction of water conservancy facilities such as dams, reservoirs, and rivers, polyester geotextiles can serve as a reverse filter layer. Their porosity is precisely controllable, allowing water to flow smoothly while effectively trapping soil particles from the dam or riverbed, preventing fine soil loss through seepage and mitigating safety hazards such as piping and dam failure. This product is resistant to acids and alkalis, resists microbial corrosion, maintains stable performance in various water environments, has a long service life, and is easy to install without complex equipment, making it suitable for the reverse filtration and drainage needs of various water conservancy projects.