Can anyone explain to me the reason why demineralized water or demi water as its called in here would have less contains in the form of fungus or bacteria in them ?

In the lab I used to work a lot with this kind of water what was very pure because of analytical analysis and the influence these ions can have on the analysis.

But I really cannot think of a reason why this water would be more sterile than tab water. Perhaps because in the old days this water was prepared by distillation but nowadays its all done by super filtering membranes under high pressure. Can anyone explain this to me ?