In the case of water, certain bacteria, present in water, are able to grow through the spaces within a filter. So although the majority will be stopped it is not absolute. There is also difficulty where bacteria or mycoplasmas do not have cell walls, so absolute size is not relevant because they are able to pass through holes smaller than their diameter.
Published by Don Sharpe
In the case of water, certain bacteria, present in water, are able to grow through the spaces within a filter. So although the majority will be stopped it is not absolute. There is also difficulty where bacteria or mycoplasmas do not have cell walls, so absolute size is not relevant because they are able to pass through holes smaller than their diameter.