Why we have to check fuel filter, here is the answer from Wikipedia:
Fuel filters serve a vital function in today's modern, tight-tolerance engine fuel systems. Unfiltered fuel may contain several kinds of contamination, for example paint chips and dirt that has been knocked into the tank while filling, or rust caused by moisture in a steel tank.
If these substances are not removed before the fuel enters the system, they will cause rapid wear and failure of the fuel pump and injectors, due to the abrasive action of the particles on the high-precision components used in modern injection systems. Fuel filters also improve performance, as the fewer contaminants present in the fuel, the more efficiently it can be burnt.
My experience and based on charade manual, this fuel filter have to be changed every 20000 km. It's better if change with orginal one since this will effect to engine performance.
So don't forget to check your fuel filter regularly.