Yes, good question Reach.
System is:
Chlorine injection
Retention tanks
Pressure tank
Mineral tank (calcite and corosex)
MTM tank (pot perm regen)
Centaur carbon tank
Softening resin tank (salt regen)
http://mywaterfiltration.blogspot.com/
System has been stable in this form since about 2010 with regular replacement of consumables and maintenance.
It's been much too long since adding/replacing calcite and corosex so I did that yesterday and it seemed to help with the smell flavor issue.
Haven't replaced Centaur carbon in a long while so have that scheduled for Tuesday. Maybe that'll help as well.
Just not sure why smell/flavor was fine before switched out/replaced the resin tank and resin.
And why smell/flavor is fine when bypassing resin tank and resin.
Note: Thursday I switched out the Purolite SST-60 with a batch from a branded bag where I could confirm origin and lot number and this didn't really make a difference (expensive, but at the time I was certain I had a bad batch of resin).
Meaning, to me anyway, it's either the new Enpress vortech tank or Fleck 7000 valve or the resin or how my water in interacting with the resin.
I'm hoping that no matter which of these it is, with the replacement of my carbon and a little more time I'll see improvement.
If carbon replacement doesn't seem to help I'll try an hour's worth of backwash as Ditto suggested.
The smell/flavor is better. I just don't remember a smell/flavor issue in the past with new resin.
My wife will be back from visiting in-laws tonight and can provide an updated smell/flavor evaluation.
As I mentioned previously, when all this started with the original batch of resin, she referred to it as poison water and refused to drink or give it to the pets.