Granular activated carbon (GAC) filters use loose carbon media to remove chlorine, bad tastes and odours, and organic contaminants. Commonly used in backwashing filter vessels for whole-house or commercial applications where a cartridge-based carbon block isn't practical for the flow rate required.

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Frequently asked questions

GAC uses loose granular carbon media in a backwashing vessel, suited to higher flow rates than a cartridge-based carbon block. Carbon block filters compress carbon into a solid cartridge, giving finer filtration but at lower flow rates.

Yes — GAC vessels typically backwash periodically to clear trapped sediment and prevent channelling, similar to a water softener's regeneration cycle.

GAC media typically lasts 1-3 years depending on water quality and usage, gradually losing its adsorption capacity as it becomes saturated with chlorine and organic compounds.