What is a GAC system and how does it work?
A GAC system consists of a metal or fiberglass tank which contains a bed of granular activated carbon (GAC). The carbon bed consists of many tiny carbo particles which hold onto impurities in the water. This material can hold radon almost like a sponge holds water. The type of carbon most effective for radon removal is not generally available at hardware stores. In your home’s water system, the GAC unit is usually installed in the main supply line after the pressure tank. Water moves through the GAC unit every time showers are run, dishes are washed or toilets are flushed. While the GAC bed holds the radon, the radon atoms decay into other elements, often referred to as daughters. The same decay process would occur if the water were simply stored in a large tank. However, to achieve the same amount of radon removal for typical home use, you would need a 4,000 gallon tank and about 30 days of storage time. 2. What is an aeration system and how does it work? Located on the main water sup
