| 210 / | HD | LIQUID PURIFICATION OR SEPARATION |
| 600 | DF | PROCESSES {14} |
| 767 | DF | .~ Separating {16} |
| 800 | DF | .~.~ Utilizing gravitational force {3} |
| 801 | ![]() | .~.~.~ Including change of mainstream flow direction {1} |
| 802 | DF | .~.~.~.~> Utilizing parallel separation passages |