If you use a filter at the pick up in the gas can, you will weed out a lot of junk that inevitably lays in the bottom of the fuel can.
A lot of folks have eliminated the screen in the Walbro carb and while the screen does pick up stuff, most of it would have blown through the carb anyway.
I am always surprised at the junk floating around on the bottom of the gas can and always wonder where the heck it came from.

3dbob