According to the shapes, the filter discs are divided into 6 types, round shape,rectangle shape,square shape,oval shape, ring shape and other special shapes.
| Items | Shapes | Drawings |
| 1 | round shape |   |
| 2 | rectangle shape |   |
| 3 | square shape |
|
| 4 | oval shape |
|
| 5 | ring shape |  
|
| 6 | special shapes |  |
