"The water then is passed through grains of carbon that has been "activated" - superheated so that vast numbers of tiny pores are opened up to trap particles that might remain in the water. It's like punching millions of additional holes in a block of Swiss cheese, said Daniel Olson of Arcadis U.S. Inc., the project engineer."
Feel free to be the first
Please review the linked page for context.
If you can think of something better than this,
please add it to the database