Rinsing paper filters before brewing is a great idea. It will extract some of the 'paper' flavor and preheat your dripper / carafe as well. It only takes a small amount of hot water to absorb across an entire filter. Be sure to empty the water you use to rinse the filter from the carafe before brewing! If you wonder why this is important, taste the water you pour through to rinse the filter. Some filters have quite a strong taste, and you don't want that in your coffee! It's one reason we do not tend to carry natural brown papers (aside from bamboo). We have found some brown paper types impart more paper flavor. Also, old filters that have been stored outside of a plastic or lined bag tend to have more paper flavor, we have found.