Carbon Block Filters - How do they work?

The Carbon Block Filter is the second stage of your RO or RO/DI System. The job of the carbon block filter is to remove many of the chemicals and organic pollutants that your RO membrane cannot remove. Some of these chemicals, such as chlorine, can damage your RO membrane quickly. 


A carbon block filter is made by combining small activated carbon granules with a binding agent to form a cylindrical-shaped filter cartridge. Specially-formulated binders are used so that the active sites on the carbon are not masked. The uniform form structure of the carbon block helps to prevent channeling and allow water to evenly flow through the media: allowing the carbon to work as efficiently as possible in adsorbing impurities. Polypropylene non-woven fabric lines the inside and outside of the carbon block filter to trap particulates and a plastic net wrap is used during the manufacturing process to help form the shape. End caps with PVC gaskets helps to eliminate any untreated water bypass. 

The carbon block acts both as a mechanical filter by physically trapping particulates and as a chemical filter by adsorbing pollutants (binding the pollutant to its surface). 

Activated carbon is extremely porous. A teaspoon of activated carbon has more surface than a football field. These large amounts of surface area are able to efficiently capture all sorts of pollutants from the water column. 

Some of these over-50 unwanted pollutants include: chlorine, bad taste/odor, pesticides, herbicides, insecticides, solvents, waterborne pathogens, VOC (volatile organic compounds), THM (Trihalomethanes) and SOCs (Synthetic Organic Compounds). 

AquaFX Carbon Block Filters utilize Coconut Shell carbon. Due to its lower inorganic ash content, it is cleaner and produces less dust and carbon fines, which may make its way past the filter. Compared to coal-based and other carbons, coconut shell carbon also contains less pollutants and provides a greater surface area with higher porosity. Being highly renewable and sustainable also makes coconut shell carbon a “greener” product than others.  


Our High-Capacity Carbon Block Filter contains 30% more carbon than our standard Chlorine Guzzler carbon block filter. High capacity carbon block filters are great for municipalities with higher than usual chlorine concentration, or if you are simply looking for more/better performance from your carbon block filter. 

While a carbon block filter is great for removing chlorine, it will not remove chloramines. Using 2 of our Chloramine Blaster Carbon Filter in series is required to remove Chloramines effectively. To learn more about chloramines removal, please see our article about article about Chloramines

At AquaFX, we offer better filters, better service!

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