An unique and patented screw filter mat that using transparent compound polymer, forming structure once by heat treatment instead of glue which is environmental friendly and recyclable material, thus it will not do harm to environmental after long time use. Thanks to its screw 3D structure mat design creates the surface area is 3 times more than the ordinary filter mat. With this, a minimum 3 times of bacteria will be cultured to improve the biochemical filtration. It is rigid in shape, will not get loose after long time of using and will last long with a minimum 5 years life span. The thickness was studied to make it in a moderate 4cm space to allow sufficient flow of water through the filter mat without clogging.