Going on memory, in a previous post about the LifeStraw carbon filter Dr. F said if the carbon filter is after the regular filter it should not grow NTM. It’s filtering the water after it’s been through the Main filter.
In the table top dispenser that is how it is. I believe someone said the water pitcher was the same way.
There were no replies when I added this, so sorry for the duplicate. I can’t find a delete button!