You can then subtract the free chlorine measurement from total chlorine to confirm the level of combined chlorine (total chlorine – free Chlorine = combined chlorine). How to Test Pool Water for ...

A Times analysis shows that increasingly complex oil and gas wells now require astonishing volumes of water to fracture the bedrock and release fossil fuels, threatening America’s fragile aquifers.

There are five barrels of produced water for every barrel of oil. Texas oil companies are increasingly using this liquid, which is trapped in the rock where drilling and fracking occur, to frack more.

A damaged pipe just north of the lake leaked 2,600 barrels of crude oil in early May, according to a report by the ...

There are five barrels of produced water for every barrel of oil. Texas oil companies are increasingly using this liquid, which is trapped in the rock where drilling and fracking occur, to frack more.

U.S. oil producers are grappling with geological limits to production growth as the country's top oilfield ages and produces more water and gas and less oil - and may be nearing peak output.