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Activated Carbon Block VS Granular Activated Carbon filter

Activated Carbon Block VS Granular Activated Carbon filter, how do you differentiate them?

What is the difference between Activated Carbon Block (ACB) and Granular Activated Carbon filter (GAC)

Activated Carbon Block VS Granular Activated Carbon filter

Activated Carbon Block VS Granular Activated Carbon filter

Both Activated Carbon Block and Granular Activated Carbon filter (GAC) is a type of carbon filter made of grounded carbon. Also, they are designed to filter chlorine odor and taste, pesticides, herbicides, and cleaning detergents

An activated carbon block is made of a compressed block of ground carbon and GAC is made of loose granules of carbon/ grounded carbon.

Activated carbon block is ground finely, heated up, and compressed into a solid block. Granular Activated Carbon filter (GAC) is not finely grounded and compressed it is just in powder/ granules.

Carbon block is fine and tightly compressed water takes a long time to flow through the filter meaning more contaminants are removed. Granular activated carbon is loose granules so contaminants can easily escape. This also explains carbon block has high adsorption compared to GAC.

Carbon block water takes a long time to go through the filter leading to a lower flow rate. Water flows with resistance because is in form of a block. GAC has a higher flow rate (water flow freely without resistance)

The loose nature of GAC and high flow rate means the media can filter more water while carbon block can purify less water.

Remember even if GAC will produce more water it is not effective compared to carbon block

Granular activated carbon doesn’t have a good contact time with water so it has a chance of lasting longer. The carbon block has longer time contact with water more contaminants will be adsorbed making it not last longer.

The capacity of carbon block filter is higher than granular activated

In granular water flow from the bottom through the media and get out from the top while Activated Carbon Block water flows through the media called radial flow.

GAC is used as a post filter. It provides final polishing before the filtered water is delivered to the faucet. Under-sink reverse osmosis is the last filter after the storage tank that helps remove any tastes or odors the water may have picked up while sitting in the storage tank. In some system is used as a pre-filter but comes before activated carbon since it cannot provide better purification

GAC filter has granular/powder form carbon inside while carbon block comes in a form of block

An activated carbon filter is used as a post-filter that can adsorb and filter. What do I mean by filtering? Carbon block can be used for filter sediment but require a specially added layer/blended material.


The carbon block has a low flow rate and better purification while granular activated carbon has a high flow rate but less purification.

Each filter has its use and is used in different stages of water purification. Carbon block is used as a pre-filter and granular activated carbon is used as a post filter/polishing filter.

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