Noone likes to pick tea leaves out of their teeth so whenever you brew Gong Fu style it is important that you decant your tea through a filter. There are exceptions (as always with tea) when you may want to go unfiltered but for the majority of your sessions you are going to need this filter.
This filter is designed to sit happily over most Gong Dao Bei's and cups and is the perfect size for the filter slot of the Gong Fu Guru.