We replaced the drier at a freezer compound compression system. The cartridge had a light green colour. There is no additive (leak search) in the system. Before we replaced 2 expansion valves at a cabinet. The valves didnīt work proberly. There was also some green stuff at the strainers. But the system is working with no further problems. My workmates and Iīve no clue whatīs going on. The system is running since 11 years. At the beginning we had some leaks at the evaporator in the walk in freezer.

Regards Michael