Trihalomethanes (THM)

What is Trihalomethane (THM)?

Trihalomethanes (THMs) are chemical byproducts formed when chlorine or other disinfectants react with organic matter, like decaying leaves or algae, in water. Common THMs include chloroform, bromoform, and dibromochloromethane, often found in chlorinated drinking water.

Why do I have an intolerance?

THMs can irritate the respiratory system, skin, and eyes. Inhalation or absorption through the skin can lead to short-term symptoms such as coughing, sneezing, rashes, or eye irritation. Prolonged exposure, especially in poorly ventilated areas such as during hot showers, can increase the risk of developing long-term health problems, including headaches, dizziness, and potential carcinogenic effects. Sensitive individuals, such as those with asthma, may experience more severe reactions.

What can I do about it?

To reduce exposure, use a water filter designed to remove chlorine and THMs. Activated carbon filters are particularly effective at filtering out these chemicals. Additionally, consider using bottled water or a filtration system for drinking and cooking. For showering, install a showerhead filter designed to remove chlorine and other harmful chemicals. Ensure good ventilation when using chlorinated water in cleaning or bathing to avoid inhaling fumes.