You will be fine with that set up provided you aren't downstream from an old mine .
Does it cope with viruses?
What's the flow rate like?
Flow is 'fine' If I hang it up it gravity filters whilst I'm doing something else, or if you use the squeeze bag its a lot quicker.
If the water has a lot of particles (peat etc) then the filter can start to clog and slow down - back-flow it with some clean water and the filter is 'as good as new' again.
It filters down to 1 micron absolute (0.001mm)
Viruses are between 20 and 400 nanometeres (0.000002 - 0.0004 mm)
So I think the answer must be NO it doesn't cope with viruses
I don't think anything will filter that small and still allow water to pass with a sufficient flow to be of any use.