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Granular Activated Carbon (GAC) System

GAC systems can reduce radon effectively when levels are below 10,000 pCi/L. A typical GAC tank is 4 ½feet tall and 10 inches round. GAC treatment is usually installed next to the well tank where your water supply first enters the house. The tank is typically filled with coconut-based activated carbon. Radon gets trapped in the millions of pores inside the carbon as the water passes through it. The carbon will also capture other contaminants, which is beneficial, but it shortens the life of the carbon bed. GAC filter media eventually becomes saturated and can no longer adsorb contaminants. GAC systems require constant maintenance.

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