Box of 100 1oz packets. Nothing will tarnish your coffee more than unclean brewing equipment. We use Urnex's Urn and Brewer cleaner in our cafes--its cleaning power is near-magical. Pour the pack contents into the receptacle, fill with hot water, let sit for at least 10 minutes, pour out and rinse! If you have significant coffee build-up, scrub after 10 minutes before emptying. One package will clean up to a 1-gallon receptacle. From Urnex: A blue-dyed cleaning powder that is formulated to remove coffee oils and residue Organically listed by the Organic Materials Review Institute and NSF-Certified for use on coffee equipment.