The best replacement for closed system is open system.

The best alternatives to closed system are rated as following:
★★★★★  open system
★★★  isolated system
★★  control volume
★  open system breast pump
★  an open system
  open circulatory system
  opened system

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Google Trends

Scale is based on the average worldwide traffic of closed system in all years. Click on graph for more.
closed system
open system
isolated system