The antifreeze was added after the dryer with the old stock dryer still installed. I put around 8 hours on it before putting the new dryer on as I wanted to work out the bugs before putting the new one on. I didn't get a chance to change that cartridge yet. I an hoping to today. I have to drop the whole dryer to change the cartridge with this being an M929, as the hydraulic hoses are against the top of the cartridge case. I shoe-gooed a piece of rubber splash guard to the top of the cartridge case to prevent a rub wear hole.
Edit: There has been no smell of alcohol, when draining the tanks, for quite some time. Apparently the breakdown of the desiccant happened shortly after I installed the MRAP dryer. I won't be using any of that stuff ever again.