How water filters work

A new type of water filter could be in the pipeline to reduce pollution in cities, with the US Department of Defense looking at the technology.

The Pentagon is looking at using water filters to help clean up the water used in homes, businesses and recreational areas in cities across the country.

The Department of Energy, which owns the technology, said it is still working out the details.

The water filters would be made of a polymer material, and would have sensors that would detect when it reaches a specific pH level, and when it exceeds a certain threshold.

If a sensor detects a pH of 6.8 or above, it would stop the flow of water in the filter.

It would then have an electronic switch that would turn on the flow control.

The technology could help remove toxins from water and reduce the impact of pollution, the Department of Defence said in a statement.

It said the technology could be deployed in cities by 2021.

The United States is one of only a few countries that use only natural water supplies to flush its sewage out of the ground.

More than 1,000 water filters are currently used by more than 70 million people in the United States.

The Department of Agriculture, which operates water systems, says it has no water filters for households, businesses or recreational areas.

It also says the technology may have other uses that would not be clear until later.