Well a porous coalbed is very similar in chemical makeup to those water filters.
Sea coral naturally contains calcium carbonate and possesses a porous architecture not unlike natural bone.
Ecuador, which also shares a porous border with Colombia, is in the throes of an economic meltdown.
We are simply talking about plugging holes, sealing a porous system that isn't working as well as it should.
Aberdeen were 2-0 down after nine minutes, with David Templeton and Rudi Skacel taking advantage of a porous defence.
"We are dealing with a porous southern border opposite Africa, " he said.
The result is a porous, honeycomb-like structure that is capable of withstanding the applied forces, but weighs very little due to its parsimonious use of materials.
The grind-it-out Tebow Broncos weren't supposedly built for a free-for-all with New England, but here they were, easily pushing the ball downfield against a porous Patriots defense.
Environmental organizations such as the Sierra Club and Defenders of Wildlife apparently are not bothered by the security risks that such a porous border creates -- at least not enough to restrain themselves from filing a lawsuit to prevent the DHS from doing the job that Congress is requiring it to do.
Future research will focus on protecting them better and investigating the use of a thin porous film to make them more robust.
The Swach's cartridge, a key component of the system, resembles Edison's electric bulb and is made up of a composite of rice-husk ash (a highly porous material derived out of paddy husk) and fine particles of nano-silver, which inhibits bacteria growth.
Roger spreads it over a lissom, a wooden board covered in a rough, porous cloth, and repeats the process until he has made up a "cheese", eleven lissoms in total, which is wheeled on rails to the press.
Polymer banknotes are printed on a non-porous plastic film, making them more durable than traditional rag-based paper bills.
Founded in 1580 by the Austrian Archduke Charles, it lies on a plateau of porous rock just above Trieste.
The remaining clan members have refused to budge, while concerns have grown that other groups from the Philippines' restive southern provinces might enter Sabah, which shares a long and porous sea border with the Philippines that's difficult to patrol.
Lastly, it needs to be covered with a layer of non-porous, non-cracked rock to provide a leakproof cap.
Instead, a spine of tough, porous limestone runs the length of the state, just off the east coast.
It is a small reminder of how porous West Africa's borders are.
"The new material is a liquid-infused elastic porous surface, which is what allows for the fine control over so many adaptive responses above and beyond its ability to repel a wide range of substances, " Prof Aizenberg explained.
The artificial bone, porous and coated with a thin layer of calcium phosphate, is implanted into the arm in place of the damaged bone.
He predicts that whatever Syrian government results from the conflict will not be in charge of its whole territory, a problem made worse by the porous nature of the country's borders.
CNN: Syria: As al-Assad's grip loosens, what could come next?
These porous sheets, which together form a coarse white powder, vastly outperformed sheets that did not have the pores, and commercially available chunks of boron nitride that is not made up of the tiny sheets.
BBC: 'White graphene' soaks up pollutants and can be re-used
Miami has a maximum elevation of 6 feet and is on porous limestone.
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So the sick and the dying head to Musina, a town on the South African side of the porous border.
There is a length of one side of a 200-year-old arch turned black and porous with pollution.
Unfortunately, the deposit is deep (480 metres down) and is located in a very unstable area which is comprised primarily of highly porous sandstone.
But with two porous defences on display, there was always a chance of another before half-time and it came from the head of Steven Taylor who powered in a left-wing corner from four yards.
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