Assertion: calcium hypochlorite's chlorine | /r/HasProperty | added after other treatment
Facets:
value: in order to ensure adequate contact time
type: PURPOSE
value: generally
type: MANNER
Source sentences:
text: It should also be as early as possible in the supply system (except that chlorine should generally be added after other treatment and should never be added before slow sand filters) in order to ensure adequate contact time.