Quick Answer
Chloramine is a chlorine-ammonia compound some water systems use as a disinfectant. It is harder to reduce than free chlorine — KDF and carbon are generally weak against it, while vitamin C / ascorbic acid media is the better-known option for shower filters.
Problem
Shoppers assume 'chlorine filter' covers chloramine, but most media do not. A filter that works for chlorine may barely touch chloramine.
Product Recommendation
ZOOSHEN offers systems with different media configurations. For chloramine, select a system that includes a vitamin C stage. Validated reduction levels are published after testing.