Pellets break up into a gooey, messy, clogging slime. You want to seperate them from the wort at the end of the boil Some people do this by starting a whirlpool in the kettle and then siphoning from the side of the kettle, or they have a valve on the kettle and some sort of filter.
Better yet, use whole hops, which are a piece of cake to seperate out.
Cheers
