Chlorine and chloramine can both be removed from home water using catalytic carbon filtration, which works through a chemical reaction that breaks down these disinfectants into harmless byproducts. Standard activated carbon removes chlorine effectively, but chloramine requires catalytic carbon or significantly longer contact time to achieve the same result.
I'm Eli, a Certified Water Specialist with over 20 years of hands-on experience installing and servicing residential water treatment systems across the country.
Why Municipal Water Contains Chlorine or Chloramine
Most city water systems add chlorine or chloramine to kill bacteria and keep water safe during distribution. Chlorine has been the standard for decades, but many municipalities have switched to chloramine because it lasts longer in pipes and doesn't break down as quickly. That stability is great for preventing bacterial regrowth in aging infrastructure, but it also makes chloramine harder to filter out once the water reaches your home. I've tested city water from the same supplier that switched from chlorine to chloramine, and homeowners noticed the difference immediately: stronger taste, drier skin, and standard carbon filters that used to work for years suddenly needed replacement every few months.
How Carbon Filtration Removes Chlorine and Chloramine
Activated carbon removes chlorine through a simple adsorption process. The chlorine molecules stick to the carbon surface and get pulled out of the water. It's fast and effective. Chloramine is a different story. It's a more stable molecule, a combination of chlorine and ammonia, and standard carbon can't break it apart efficiently. That's where catalytic carbon comes in. It doesn't just trap chloramine; it catalyzes a reaction that splits the molecule so the carbon can remove both the chlorine and ammonia components. A catalytic carbon filter handles chloramine without the constant media replacement that standard carbon requires.
I've seen homeowners try to solve chloramine problems with regular carbon systems, and they're frustrated within months. The carbon gets exhausted quickly, and breakthrough happens faster than anyone expects. Switching to catalytic carbon solves that issue in most cases, especially when the system is properly sized for the household demand.
Whole House vs. Point-of-Use Treatment
You can remove chlorine and chloramine at the point of entry, which treats all the water coming into your home, or at the point of use, like under the kitchen sink. Whole house systems protect every fixture, faucet, shower, and appliance. Point-of-use systems only treat the water you drink or cook with. I generally recommend whole house filtration when someone is concerned about skin irritation, wants to protect appliances, or just prefers not to shower in chlorinated water. For families focused only on drinking water quality, a point-of-use reverse osmosis or carbon system can be a simpler starting point. Our whole house water filtration systems are built to handle chlorine and chloramine across the entire home.
One detail most people overlook: if you're on city water with chloramine and you also have a water softener, the chloramine can slowly degrade the resin. I've replaced softener resin that should have lasted ten years but failed in four because chloramine wasn't filtered out first. Pre-filtering before the softener extends the life of everything downstream.
What Size System You Actually Need
System sizing depends on your water usage, the number of bathrooms, and how much chlorine or chloramine is in your supply. A smaller catalytic carbon filter works well for a one- or two-bathroom home, while larger households need higher-capacity units to maintain flow rate and contact time. Contact time is critical. If water moves through the carbon too fast, chloramine doesn't get fully reduced. I've corrected installs where someone bought the right type of carbon but undersized the tank, and the system couldn't keep up during peak morning demand. You need enough media volume and the right flow rate to let the catalytic reaction happen.
Testing your water before and after installation confirms the system is doing its job. I always recommend a baseline chlorine or chloramine test so you know what you're starting with. You can learn more about treatment strategies on our chlorine and odor filtration solutions page.
Common Mistakes and What Actually Works
The most common mistake is assuming any carbon filter will remove chloramine. It won't, or at least not for long. Another issue is neglecting backwash or regeneration schedules on larger systems. Catalytic carbon doesn't regenerate the way softener resin does, but it still benefits from periodic backwashing to clear out trapped sediment and maintain even flow distribution. I've also seen people install carbon filters without any pre-filtration for sediment, and the carbon bed gets clogged with rust or dirt within months. A simple sediment pre-filter protects the carbon and extends its life significantly. If you're comparing options, our city water filtration bundles include the components that work together rather than requiring you to piece together a system on your own.
One thing that surprised me early in my career: some customers reported that removing chloramine made their water smell worse temporarily. That's because chloramine was masking other odors in the distribution system. Once it's gone, you notice what was always there. In those cases, additional filtration or oxidation is needed to address the underlying issue, not just the disinfectant.
For supporting education before choosing a system, I would use Bad Taste and Odor Water Filter Solutions.
Frequently Asked Questions
Does a standard Brita filter remove chloramine?
Most pitcher filters use standard activated carbon, which is not effective at removing chloramine. They may reduce chlorine and improve taste, but chloramine requires catalytic carbon or much longer contact time than a pitcher can provide.
How often does catalytic carbon need to be replaced?
Catalytic carbon media typically lasts three to five years in a properly sized whole house system, depending on water quality and usage. Regular backwashing and sediment pre-filtration help extend media life and maintain performance.
Can I use a carbon filter if I have well water?
Yes, but well water often contains iron, manganese, or sediment that can foul carbon quickly. It's best to treat those contaminants first with oxidation or sediment filtration before the water reaches the carbon stage.
Will removing chloramine affect my water pressure?
A properly sized catalytic carbon system should not reduce water pressure noticeably. Undersized systems or clogged media beds can restrict flow, which is why correct sizing and maintenance matter.
Do I need to test my water before installing a carbon filter?
Testing helps confirm whether your water contains chlorine or chloramine and at what levels. It also reveals other contaminants that may need treatment and ensures you choose the right filtration approach from the start.