| 210 / | HD | LIQUID PURIFICATION OR SEPARATION |
| 348 | DF | FILTER {25} |
| 418 | DF | .~ With flow controller for material being treated {5} |
| 420 | DF | .~.~ Selective directive flow relative to filter {4} |
| 424 | DF | .~.~.~ Multi-way valve {1} |
| 425 | DF | .~.~.~.~ Backwash {1} |
| 426 | | .~.~.~.~.~ Encased |