The ground below 150 metres (500 feet) deep is said to contain much less arsenic.
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Once the arsenic is in contact with the sulphur, it will bind to it.
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The filters can also be used again and again until they are saturated with arsenic.
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She found her husband lying dead in the south-west tower having taken some arsenic-based weedkiller.
"I wouldn't say it's absolutely free, but it's much freer of arsenic, " Professor Natelson added.
BBC: Millions of Bangladeshis are forced to drink unsafe water
It said the detected arsenic concentration was twice the amount normally found in sludge.
Her liver was contaminated with fatal doses of metals such as aluminum and arsenic.
Signs warn that the arsenic level is 25 times the level fit for human consumption.
Tailings are rendered inert and any arsenic in the ore is said to be 100% fixed.
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Symptoms of arsenic poisoning can take eight to 14 years to manifest in a person.
Arsenic occurs naturally in the ground, but it has been unclear how it gets into water supplies.
He said second-hand smoke contained more than 4, 000 chemicals, including benzene, formaldehyde, arsenic, ammonia and hydrogen cyanide.
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Wolfe-Simon and her colleagues found the critter in a lake in eastern California with high arsenic concentrations.
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Most landfills here have arsenic problems stemming from unchecked disposal of chemicals containing arsenic, such as herbicides.
At the time, it was the custom of winemakers to dry their casks and basins with arsenic.
It was possible to walk into a chemist and buy not only opium and cocaine, but even arsenic.
The report at the American Chemical Society Meeting adds to the already well-known issue of arsenic in rice.
Over a decade ago, scientists in Bangladesh discovered that drinking water drawn from wells was contaminated with arsenic.
Greenpeace said samples of the sludge it took on Tuesday contained "surprisingly high" levels of arsenic and mercury.
Coal ash contains low concentrations of arsenic, mercury and other heavy metals, although it's not classified as hazardous.
The skin lesions that come from prolonged exposure to arsenic are already evident on the hands and feet of many villagers.
ECONOMIST: Scientists have offered a solution to the arsenic wells
Now, however, it seems that the water in many of these wells has been contaminated by arsenic in the surrounding rock.
ECONOMIST: Scientists have offered a solution to the arsenic wells
The chart directly below the infographic lists the rice and rice products tested and the levels of arsenic found.
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Arsenic can damage most of the body's major organs and the immune system.
Heavy-metal contamination in China's soil also includes high amounts of lead and arsenic.
More than 1, 000 people demonstrated in Kuala Lumpur in support of Mr Anwar after the disclosure about the arsenic.
Other senior ministers have suggested that the arsenic poisoning may have been self-inflicted.
Others contained large amounts of harmful elements such as lead, arsenic and mercury.
Nikolaidis was invited to present his invention at an international conference on arsenic in Dhaka, Bangladesh, in early February.
But subsequent medical tests cleared him of any acute or chronic arsenic poisoning.
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