How a Whole House (Point-of-Entry) System Works
A whole house system is installed at the "point of entry" — typically where the main water line enters the house, usually in a basement, crawlspace, garage, or a dedicated mechanical closet. All water passes through the filtration media before it's distributed to the rest of the home.
Most systems use one or more tanks filled with filtering media (such as carbon) that the water flows through under normal household pressure. As water passes through, contaminants and chemicals that affect taste, odor, or clarity are reduced. Clean water continues on to your fixtures.
Because everything runs through the system, a whole house setup is different from a single under-sink filter or pitcher filter, which only treats water at one tap. If you want details on cost before going further, see our whole house water filter cost guide.
What Whole House Filtration Removes
Whole house systems are generally built around activated carbon or catalytic carbon media, sometimes paired with sediment pre-filters or UV. Depending on the media and configuration, a system can help with:
- Sediment — dirt, rust particles, and other visible debris
- Chlorine taste and odor (NSF/ANSI 42 covers aesthetic chlorine/taste reduction)
- Chloramine taste and odor, which typically needs catalytic carbon and more contact time than standard carbon
- General off-tastes and odors that make tap water less pleasant to drink or cook with
Carbon vs. Catalytic Carbon vs. KDF vs. UV
Not all filter media behave the same way. Here's a general comparison of the technologies commonly used in whole house systems:
| Media/Technology | Best For | Notes |
|---|---|---|
| Standard activated carbon | Chlorine taste & odor, general aesthetics | Widely used; slower to address chloramine |
| Catalytic activated carbon | Chloramine reduction, hydrogen sulfide odor | Needs more contact time/larger tank for chloramine — see our chloramine removal page |
| KDF media | Often blended with carbon for chlorine reduction and to inhibit bacterial growth on the media bed | Usually paired with carbon rather than used alone |
| UV disinfection | Addressing microorganisms in water | Does not remove chemicals, taste, or odor — used alongside filtration, not instead of it |
Because chloramine is more chemically stable than chlorine, removing it generally calls for catalytic carbon and a properly sized tank — plain carbon alone often isn't enough.
Sizing a Whole House System Correctly
A whole house filter that's too small for your home can restrict water pressure or wear out media faster than expected. A few factors determine proper sizing:
Peak flow rate
Sizing is based on the home's peak water demand in gallons per minute (GPM) — how much water could be running at once if a shower, dishwasher, and a hose bib are all in use.
Number of bathrooms and fixtures
More bathrooms and fixtures generally mean higher peak demand, which can call for a larger tank or a higher-flow valve configuration.
Plumbing pipe size
Most residential homes run 3/4" or 1" supply lines; the system's inlet/outlet connections need to match without creating a bottleneck.
Service flow rate of the media
Each tank size and media type has a rated service flow rate — the maximum flow it can treat effectively before performance drops. An undersized tank run past its rated flow won't filter as well, even if pressure seems fine.
Because sizing depends on your specific home, we start with a free water test and a look at your plumbing and water use before recommending equipment.
Maintenance and Cartridge/Media Changes
Whole house systems need periodic upkeep to keep performing as designed:
- Sediment pre-filters are typically the most frequent change item, since they catch physical debris
- Carbon or catalytic carbon media has a usable life based on total water volume and contaminant load, after which it needs to be replaced or, in some tank styles, backwashed
- Valve heads and bypass valves should be checked periodically to confirm they're cycling or operating correctly
- Homes with higher sediment loads or heavier water use may need more frequent service than homes with lighter use
We offer ongoing service and maintenance plans so you're not guessing when it's time for a change.
Our Process: Test, Recommend, Install, Service
- Free water test — We start by testing your water and asking about your plumbing, fixture count, and what's bothering you about your current water (taste, odor, chloramine, etc.). Start with our free water test.
- Recommendation — Based on results and your home's layout, we recommend a system and media type sized to your actual demand — not a one-size-fits-all package.
- Installation — We install at the point of entry, typically near the main shutoff, and confirm proper flow and pressure afterward.
- Ongoing service — We schedule media/cartridge changes and check-ins so the system keeps working as intended.
If you'd rather see numbers before scheduling anything, our whole house water filter cost guide walks through typical price ranges and what drives them.
Frequently asked questions
What does a whole house water filtration system actually remove?
It depends on the media. Carbon and catalytic carbon systems are generally used for chlorine, chloramine, and taste/odor reduction, plus sediment filtration. They are not the same as reverse osmosis and typically aren't the primary tool for lead, fluoride, or dissolved minerals.
Does a whole house filter soften water too?
No. Filtration and softening are different processes. A water softener uses ion exchange to address hardness minerals; a carbon filter does not. Many homes use both — see our water softeners page.
Will a whole house filter remove chloramine from Charlotte Water?
Charlotte Water disinfects with chloramine, as noted in its Drinking Water Quality Report. Catalytic carbon media, properly sized for adequate contact time, is the typical approach — see our chloramine removal page for more detail.
How much does a whole house water filtration system cost in Charlotte?
A typical installed cost for a whole-house filter is roughly $800–$1,600, per a third-party estimate (contractorplus.app, Aug 2026). This is a general industry range — your actual quote depends on your home's size, plumbing, and the equipment chosen. See our cost guide for details.
How is a whole house system different from a water filter pitcher or faucet filter?
A pitcher or faucet filter only treats water at that one point of use. A whole house system treats water for the entire home — every shower, sink, and appliance — before it's distributed.
How often does the filter media need to be replaced?
It varies by media type, tank size, and household water use. Sediment pre-filters typically need the most frequent attention. We outline a maintenance schedule as part of installation and offer ongoing service and maintenance.
Will a whole house filter reduce my water pressure?
A properly sized system, matched to your home's peak flow rate and plumbing, should not create a noticeable pressure drop. Undersized systems are the usual cause of pressure complaints, which is why sizing matters.
Do I need a whole house filter if Charlotte Water already meets safety standards?
Charlotte Water's water is reported to meet state and federal requirements. Many homeowners still choose filtration for taste, odor, chloramine smell, or general peace of mind rather than a safety concern.
Can a whole house filter help with PFAS?
Activated carbon can play a role in PFAS reduction depending on the media and system design. See our dedicated PFAS water filtration page for more detail and for certification considerations.
Do you test my water before recommending a system?
Yes. We start every whole house filtration project with a free water test so the recommendation is based on your actual water and home, not guesswork.
Can a whole house system be installed on well water?
Whole house filtration is used on both municipal and well water, though well water often needs additional pretreatment depending on what's present. See our well water treatment page.