Granular Activated Carbon Filter
Granular Activated Carbon also known as GAC/UDF filters, is carbon that has been treated with oxygen to make it porous, it hat also been broken up into granulars to further increase the surface area for chemical bondage to occur. The water passes through the filter allowing the organic materials and chlorine to effectivly bond with the carbon molecules, thus removing them from the water.
Granular Activated Carbon (GAC) filters effectiveness depends on the flow rate and contact time with the water. If the flow rate is very high their efficiency could drop to as low as 0% but if the flow rate is slow their efficiency can even exceed those of various different carbon forms.
Granular Activated Carbon is used to absorb natural organic compounds and synthetic organic chemicals which affect the colour, taste and odour in drinking water.
The GAC filter may vary in colour and design depending on the manufacturer. The internal carbon media is the same.