Carbon Filtering of Water
Have you ever wondered how the water you drink gets cleaned and purified? There are three main ways: chemical, biological, and physical barrier filtering. The first two use specific agents to alter the waters chemistry. In the third, water is passed through a barrier in order to remove particulates and harmful substances.
The most common barrier used in water filtering is carbon. Because of its natural design, carbon provides a large surface area in relationship to its mass. This means that a small amount of carbon translates to a huge surface area that attracts and filters out contaminants from water.
This is accomplished by activating the carbon with a positive charge. That charge will the attract the negatively charged elements that contaminate the water. As water is pushed through the carbon filter, sediment, chlorine and volatile organic compounds (or VOCs) are removed from the water. The slower the rate of water flow, the longer the water is exposed to the carbon and the more contaminants are removed. Water with high concentrations of salts, minerals, and dissolved inorganic compounds will need a different type of filter, as carbon is not effective in removing these specific contaminants.
In addition to being used in many water filters , carbon can be used in air purifiers.
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