The first thing that happened in the Barnett Shale, which was the very first successful commercial shale play, was that Mitchell Oil tried and experimented for years and years with different types of fracking technology, trying to find something that would work. The amazing thing was that in the end the successful answer was basically just water and essentially no additives. That coincidentally means it's also less expensive and makes it more competitive.
When we say no chemicals, we still put in the prime chemicals—and we've listed them all on our web page again. We use something to break the surface tension of the water so that the water will slick, and then something—it's actually a food additive, a gel—to help hold the sand. Those are the two prime things that we use. On top of that, there will be small amounts of iron control, and biocides to make sure that we don't get bacteria growth--those types of things.