Quick take
First determine whether the utility uses free chlorine or chloramine. Then choose point-of-use carbon, shower filtration or whole-house catalytic carbon based on where the nuisance matters.
Why utilities leave a disinfectant residual
Public systems maintain disinfectant in distribution pipes to control microbial regrowth. The odor can vary with temperature, distance from the plant, flushing and seasonal treatment changes.
Chlorine and chloramine need different treatment expectations
Free chlorine is easier for standard activated carbon to reduce. Chloramine is more persistent and can require catalytic carbon or longer contact time.
Treat the right scope
If the complaint is only drinking-water taste, an under-sink or countertop filter can be enough. If every shower and faucet smells strongly, whole-house filtration may be more rational.