Hi, my question/questions; I have 2 co2 trans critical system that has returned a higher than specified water content in an oil analysis and I have been told not to bother to change the liquid line driers and instead put liquid line drier cores in the suction which I did and waited 2 weeks and retested, one system water/acid increased and the other decreased? Im thinking possibly one was contaminated in the sampling process? But seeing the level is still high I changed the drier cores once more and on removing the drier cores what struck me was the cores are now orange! So can anyone confirm that it is indeed a wast of time changing the LLD and possibly tell how the drier cores turned orange?

Cheers