Chloramine is a disinfection agent comprised of chlorine + ammonia used as an alternative to chlorine in some city water treatment facilities. They use chloramines for two big reasons: (1) chloramine is less reactive, so it does not create as many disinfection by-products as chlorine, and (2) chloramine is more persistent, and remains in the treated water through the distribution network all the way to the taps in the homes the treatment facility serves. For customers with chloramine in their water, we offer the EQ-400. The EQ-400 features upgraded catalytic activated carbon media , which has a higher surface point and is able to handle the aggressiveness of the chloramine for a longer period of time than the standard coconut shell carbon used in the standard whole house systems. The EQ-400 is available for purchase by calling the Aquasana Water Specialists at 866-662-6885.