Published: May 9, 2011

    Learn About Pelican Carbon – Water Filters

    Pelican Whole House Filter and Salt Free Softener

    Pelican utilizes a blend of high-grade coconut shell and bituminous activated carbons in the Pelican Carbon Series Premium Whole House Water Filters. The purpose of combining two types of carbons is to gain a wider range of contaminant filtering capabilities offered from each type of carbon.

    GAC filtration is recognized by the Water Quality Association as an acceptable method to maintain certain drinking water contaminants within the limits of the EPA National Drinking Water Standards. Activated carbon works by attracting and holding certain chemicals as water passes through it. Activated carbon is a highly porous material; therefore, it has an extremely high surface area for contaminant adsorption.

    What is Adsorption?

    Adsorption is the adhesion of atoms, ions, biomolecules or molecules of gas, liquid, or dissolved solids to a surface

    Adsorption verses Absorption

    The process of “adsorption” is highly different from the definition of “absorption.” Where “absorption” occurs when a substance penetrates a solid, “adsorption” refers to a substance adhering to the surface of a solid. Activated carbon is utilized in the adsorption process, and is most often involved in the purification of drinking water. It can be made from several materials, of which, the most popular are coal, wood, and coconut shells due to the large size of their surfaces and the extent to which they are porous. The larger the pore size and surface area of the media, the longer the activated carbon functions.

    What is activated carbon?

    Activated carbons are manufactured from coconut shell, peat, hard and soft wood, lignite coal, bituminous coal, olive pits and various specialty materials. Manufactured by chemical or high temperature steam activation, this highly porous adsorptive medium has a complex structure that is composed primarily of carbon atoms. Its network of pores within a rigid carbon skeleton consists of disordered layers of carbon atoms which are linked together by random chemical or carbon bonds.

    These carbon layers are stacked unevenly, creating a structure with various shaped and sized cavities between the carbon layers. The basic mechanism through which activated carbon removes impurities from gases or liquids through the attraction of molecules into this network of pores is referred to as adsorption. Adsorption is the key to the performance of activated carbon.

    About coconut shell based activated carbon

    Pelican Whole House Filter and Salt Free SoftenerPelican uses a non-chemically impregnated coconut based activated carbon that has been surface modified during manufacturing. This surface modification significantly enhances its ability for superior removal efficiency and rapid decomposition of chloramines. Coconut shell activated carbon is the preferred carbon to remove VOC’s from drinking water in POE systems.

    Coconut shell Activated Carbon (AC) is also more environmentally friendly or green. The coconut tree produces coconuts three times a year. The tree is not killed to harvest the coconut shells; therefore it’s from a renewable resource. In addition, part of the carbon dioxide produced during manufacture of coconut shell carbon is removed by the coconut trees and produces oxygen.

    About bituminous coal based activated carbon

    Coal based activated carbon originates from coal that has undergone a steam activation process to create its activated carbon form. During activation, it creates millions of pores at the surface of the carbon thus increasing the total surface area. Activated carbon pores can be divided into three general sizes Micro-pores (diameter in the range of less than 2 nm), Meso-pores (diameter in the range of 2 – 25 nm), and Macro-pores (diameter in the range of above 25 nm). Coal based carbon has mainly meso-pores and macro-pores and due to its unique distribution of pores diameter, coal based activated carbon are very popular in the gas phase purification, potable water purification industries, wastewater purification industries and aquarium/pond water purification industries.