Chlorine exposure can cause physical fatigue, mental depression, and a lowered auto-immune function, making it harder for your body to ward off infectious diseases. Taking a nice hot shower creates Chlorine and Volatile Organic Compound (VOC) gases that contain much higher concentrations of these chemicals than the actual water. Many cities are switching to Chloramine, a combination of chlorine and ammonia, for disinfection.
Please note existing Carbon and KDF filters only remove free chlorine and are not effective in removing Chloramines. Vitamin-C is the only effective scientifically proven way to neutralise Chloramines.