[marktwain]

Frac liquids returned to the surface is the chemical mix that was pumped unded high pressure during the Frac job If could contain acids, petrol chemicals and what ever else the PE ordered for the job... it is waste.

Give us some amounts.

Ordinary water contains lots of things in tiny amounts.

The dose is the poison. Tiny amounts of things are harmless.

Much may be less harmful than a lot of ordinary well water.

The amount of various stuff will depend on each location.

[Deaf Smith]

Enough that the waste water is toxic. Usually disposed by pumping into under ground salt domes.

Each company's frac fluid is proprietary information. Even the EPA does know what is used.