Because in the real world there is pipework that wasn't installed today and that has a biofilm and storage reservoirs have to be vented thereby allowing air to come in and out of the tank and this can carry contaminants even if there is insect screening.
Published by Steve Oxtoby, Process Engineer
Because in the real world there is pipework that wasn't installed today and that has a biofilm and storage reservoirs have to be vented thereby allowing air to come in and out of the tank and this can carry contaminants even if there is insect screening.