Hmmm, I have been going through DI resin fast, and we have Chloramines as well.
I did not know that might be related.
I have also been rather lax in remembering to replace the DI resin. I wonder if
Chloramines have been getting into my tank.
Perhaps it is time to add a couple of pre-filter stages.
Those 20 inch versions are interesting. It should reduce flow rate through media.
I like the "reduce maintenance" concept.