As of 6/20/19
Cleaned air check in brine tank of softener.
Cleaned toilet tanks in house.
This along with all new injectors and seals and spacers should resolve any air in plumbing and iron in toilet tanks.
Check for air and iron in toilet tanks by 7/20/19.
If air remains check other two brine air checks and post question as to alternate air entry points.
If iron remains consider replacing water heater and/or softener valve.