In brief
The pure type of fuel is not a measurement of all particles.
Useful to know
The fuel filter retains dirt before it reaches sensitive feed and injection components. HELLA offers various performances designed for the respective vehicle and fuel system. [1]
Do not confuse the filter with the pump: one cleans, the other creates a feed. When selected, specify the fuel and the exact node; the common name does not prove that two filters have the same connections or functions. If a performance involves separation of water, this should be established according to the specification and not assumed for each product.
Sources
For further detail and to check the information: