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“The newer ones have sodium sulfate, and are safe,” Rex says, stressing that patients still must drink the recommended amounts of water to avoid dehydration.

The inner box contained a can full of the chemical sodium sulfate decahydrate, which rested on top of the glass tubes and kept the cells from overheating.

After they tested the mounds, state geologists discovered that they are layered formations of a mineral known as mirabilite, a crystalline sodium sulfate.

On game nights, the groundskeeper marked yard lines with a white powder -- sodium sulfate -- donated by the plant.

The site produces materials such as boric acid, sodium carbonate, sodium sulfate and several specialty forms of borax used in soaps and other industrial materials.