210 / | HD | LIQUID PURIFICATION OR SEPARATION |
600 | DF | PROCESSES {14} |
702 | DF | .~ Making an insoluble substance or accreting suspended constituents {14} |
703 | .~.~ Effecting flotation {1} | |
704 | DF | .~.~.~> Including chemical addition (with or without bouyancy gas) {1} |