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Adsorption is a form of separation that involves removing dissolved substances by physically binding them to the filter material.
Indeed adsorption is the process by which molecules, colloids and particles adhere to a surface by physical action and without any chemical reaction. Activated carbon (oxidized at high temperatures) containing millions of minute sites is an effective mean of adsorbing dissolved organic and other chemicals that cannot be removed by physical filtration.
This process used in combination with filtration and/or disinfection allows removing undesirable tastes and odors, chloramines, some pesticides and herbicides, and other chemical contaminants.