Most filters have holes in the bottom that match the holes in their walls. Instead, we designed the bottom of the Rumble Jar and Rumble Go filters to feature a hole-free dish that we call a "silt pan" (have a look at the close-up photo here). When you're removing the filter from the jar, that silt pan collects some of the excess sediment and prevents it from draining into your drinkable brew. If there were holes in the bottom, that sediment would immediately drain out into your coffee. Our silt pan certainly doesn't capture all of the silt/sediment, but we were definitely able to notice a difference.