[Dysart]

Some worry about what companies are pumping into the ground, but it is 91 percent water and 9 percent sand, with about 1 percent of other substances, Larsen said. Those additives are not so toxic, and are composed mostly of things like salt, borate salts, hydrochloric acid and guar resin, an emulsifier also used in foods such as ice cream, he said.

And the EPA's smears to the contrary won't alter these facts.

[BuffaloJack]

For twelve years I designed high pressure instrumentation for fracking systems. At that time I needed to know what the fracking slurries were composed of so that my precision instruments could be designed to hold up in service.
The slurries are sand, water. and emulsifiers. The emulsifiers are typically casein (a milk product), gelatin and bean gums (guar, tragacanth, etc.). They aren’t poisons, most, in fact are edible. The small amount of hydrochloric acid or sodium hydroxide used is to buffer the pH of the slurry for maximum thickening, so that the sand doesn’t settle out quickly. As for how much they use, these people have an eye on cost. They don’t use any more than they need, less than 1 percent.