This package of 350 AeroPress microfilters should last for monthsThe Micro-filter removes grit, unlike other press-type coffee makersThe filters are designed for use with the AeroPress, an entirely new way to make coffeeThe AeroPress's ideal water temperature and faster brewing yields rich flavor with lower acidity and without bitternessWater and grounds are mixed together for 10 seconds, then gentle air pressure pushes the mix through a micro-filter in just 20 seconds