| http://www.w3.org/ns/prov#value | - In the mid-1990s, however, environmental groups asked for more regulation of fracking under the Federal Safe Drinking Water Act.The fracking products injected to break up rock are mainly water and sand, but on average, 0.5% are specialty chemicals such as biocides (to prevent bacterial contamination of the shale) and corrosion inhibitors.
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