Granulated Activated Carbon (GAC), is used to remove contaminants and impurities from water. Carbon is probably the most absorbent material known to man. Moreover, it is exceptionally efficient because of thousands of tiny pores that can absorb. For example, a teaspoon of granulated activated carbon has an inner filtering surface area of half the size of a football field.
A number of different substances are used to make granular activated carbon, such as bituminous, wood and coconut shell. Of these, coconut shell is the most expensive but also the most effective as it has the ability to remove even the smallest particles of contaminant.
HOW IT WORKS
Carbon is positively charged, so it attracts negatively charged impurities such as chlorine, some cancer-causing chemicals, and volatile organic compounds. Its ability to accomplish this process it’s called ADSORPTION and is dependent on time. Time is required for the organics to diffuse into the carbon particles and become adsorbed. Beyond this, The temperature will affect the contact time, pH, type of contaminant, and its concentration, granulated activated carbon particle size, and the specific type of granulated activated carbon material.
GRANULATED ACTIVATED CARBON FILTERS VS CARBON BLOCK FILTERS.
The best majority of carbon water filters are made with granular activated carbon (GAC) Figure 1, or powdered block carbon filter Figure 2.
Carbon block filters are the furthermost effective since there is a larger ratio of activated carbon surface area to water. Moreover, because the powdered block form is denser and water travels through it more slowly.
The larger surface area created by the block carbon, and the more time the water is in contact with the carbon, the more contaminants are removed.
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