What wound up being the issue with the doser head?
I bought that replacement pump and swapped it out but I havent done anything with the original pump yet. I suspect the original one probably needs to be thoroughly cleaned out and it would probably be ok, just didnt want to chance one that I had issues with for alk control. Maybe I will take it apart this weekend and get it cleaned up.
I have not had any issues since I replaced this pump, or with the other two dosing pumps that got water in them that I cleaned out.