[Vinnie]

....about one-third of the active wells now use this innovative drilling process that uses chemicals, sand and water to crack shale rock.

What are the chemicals used and are the same chemicals used at every frack site?

I'm a 'drill baby drill' kinda guy, just curious.

[thackney]

A couple good introduction on the subject.

http://www.halliburton.com/public/projects/pubsdata/hydraulic_fracturing/fracturing_101.html

http://fracfocus.org/hydraulic-fracturing-process

[ProtectOurFreedom]

What are the chemicals used and are the same chemicals used at every frack site?

See FracFocus, What Chemicals Are Used.