| 210 / | HD | LIQUID PURIFICATION OR SEPARATION |
|
| 348 | DF | FILTER {25} |
| 483 |  | .~ Supported, shaped or superimposed formed mediums {11} |
| 484 | DF | .~.~> Medium within foraminous supporting container or sheath |
| 485 | DF | .~.~> External cage-type support |
| 486 | DF | .~.~> Spaced wall type, e.g., hollow leaf {1} |
| 488 | DF | .~.~> Abutted or superimposed members {2} |
| 493.1 | DF | .~.~> Pleated {4} |
| 494.1 | DF | .~.~> Convolute {2} |
| 495 | DF | .~.~> Single ring or closed frame type |
| 496 | DF | .~.~> Bound, fused or matted, e.g., porous shapes, sponges, etc. |
| 497.01 | DF | .~.~> Cylindrical, conical, or trough shape {3} |
| 498 | DF | .~.~> Perforated or grooved plates |
| 499 | DF | .~.~> Screens, e.g., woven |