You need to look for ammonia in the sanitation section.
I suppose I should have said you can remove monochloramine with a very expensive carbon filter made for the purpose but really ascorbic acid is just cheaper. So many sites just call it chlorine as a group to include mono, di and trichloramines. Catalytic carbon is activated carbon that has gone through additional treatment to enhance carbon’s capacity to facilitate chemical changes. Chemical reactions require a catalyst. The surface area of catalytic carbon has been structurally enhanced and altered to provide a space for chemical reactions to occur. Catalytic carbon still possesses the remarkable adsorption properties of activated carbon, but it has been supercharged to target other contaminants as well. This includes chloramines. When chloramines come in contact with the catalytic carbon, a chemical reaction catalyzes a separation of the ammonia and the chlorine and converts them into harmless compounds in the water.
an RO system must be designed for chloramine removal not all systems will work.
It also looks like Humic acid will remove it as well as ascorbic acid but I have not investigated that yet.
This is an excerpt from the San Francisco Public Utilities Commission:
QUESTIONS REGARDING CHLORINE AND CHLORAMINE REMOVAL FROM WATER Updated March 2015 Q: Is it necessary to remove disinfectants from drinking water in a home setting? A: No, chlorinated and chloraminated water is safe for people and animals to drink, and for all other general uses including bathing. EPA believes that drinking water disinfected with monochloramine that meets regulatory standards is safe to use and it does not need to be removed. (USEPA, 2009) The removal of either chlorine or chloramine from drinking water is not necessary for public health but some customers may elect to do so for common household purposes based on personal preference. Chloramine is not a persistent disinfectant and decomposes easily from a chemistry point of view (Valentine et al, 1998) but for water supply purposes chloramine is stable and it takes days to dissipate in the absence of substances exerting chloramine demand (Wilczak et al., 2003b). Therefore, it is not practical to remove chloramine by letting an open container of water stand because it may take days for chloramine to dissipate. However, chloramine is very easily and almost instantaneously removed by preparing a cup of tea or coffee, preparing food (e.g., making a soup with a chicken stock). Adding fruit to a water pitcher (e.g., slicing peeled orange into a 1-gal water pitcher) will neutralize chloramine within 30 minutes. If desired, chloramine and ammonia can be completely removed from the water by boiling; however, it will take 20 minutes of gentle boil to do that. Just a short boil of water to prepare tea or coffee removed about 30% of chloramine. Conversely, chlorine was not as consistently removed by boiling in SFPUC tests. If desired, both chlorine and chloramine can be removed for drinking water purposes by an activated carbon filter point of use device that can be installed on a kitchen faucet. If desired, both chlorine and chloramine can be removed for bathing purposes by dissolving Vitamin C in the bath water (1000 mg Vitamin C tablet will neutralize chloramine in an average bathtub). SFPUC does not recommend that customers remove disinfectants from drinking water. Customers desiring to do so should consult with their physician.
The entire article is here:
sfwater.org
You just have to look with the right nomenclature to find this stuff. Chloramination is the word to describe water treated with chlorine and ammonia.
en.wikipedia.org
