Any porous material that enables the working medium to pass through and intercepts solid particles or droplets to achieve separation or purification is called a filter medium.

Polyester non-woven fabric​, also known as geotextile, is a water-permeable geosynthetic material made of synthetic fibers by needle punching or weaving. The finished product is cloth, generally 4-6 meters wide and 50-100 meters long.

Polyester non-woven fabrics​ are made by distributing polyester filaments evenly on the running screen curtain through equipment such as screw extruder and spinneret at a specific temperature and pressure to form a fluffy fiber web, and then A non-woven fabric formed by repeated puncturing by a needling machine.

Non-woven fabric, the standard name is non-woven fabric, which is defined as: directional flow ADL non-woven fabric or randomly arranged fibers are combined with each other by friction, cohesion or adhesion or a combination of these methods.