Extract from SALA SRL Manual:
3.7 USE: When attached to the SRL, the worker is free to move about within recommended working areas at normal speeds. The lifeline should extend smoothly and retract without hesitation. If slack line condition is created in normal use the unit should be returned to DBI-SALA for service. Should a fall occur, the SRL will lock and arrest the fall. Upon rescue, remove the SRL from use. Inspect as described in section 5.0. When working with the SRL, allow the lifeline to recoil back into the device under control. A short tag line may be required to extend or retract the lifeline during connection and disconnection. Allowing the lifeline to be fully extended for long periods of time may cause premature weakening of the retraction spring.