Quick Answer
Municipal treatment typically follows four stages: coagulation (clumping particles), settling (sedimentation), filtration (removing particles), and disinfection (chlorine or chloramine). The result is water that meets regulated safety standards before it enters the distribution system.
Problem
Understanding treatment helps explain why disinfectants like chlorine or chloramine are in your tap and shower water in the first place.
Product Recommendation
Knowing the treatment process clarifies what a shower filter can and cannot do — it cannot replace the utility's job, but it can reduce chlorine/chloramine at your shower. See /water-science/chlorine-vs-chloramine.