A whole home carbon filter sits on the main water line where it enters the house and treats every
tap, every shower and every appliance. Its job is taste, smell and disinfection byproducts, not
hardness. In Calgary that is a more modest job than most filter marketing suggests, because Calgary
disinfects with free chlorine rather than chloramine, and free chlorine is the easier of the two to
remove. 180 Plumbing and Heating installs and services whole home carbon filtration across
southeast Calgary, and we will tell you when you do not need it. Call 403-404-9975.
What is actually in Calgary’s water
The City of Calgary treats water at two plants and disinfects with chlorine. The treatment tour
describes a dose of sodium hypochlorite after clarification, then “another dose of chlorine is
added in a process called post-chlorination” before the water enters the distribution system. The
City’s published water quality data reports a free chlorine residual between roughly 0.8 and
2.0 mg/L, against a required minimum of 0.2 mg/L.
Free chlorine, not chloramine. That distinction matters, because a great deal of water filter
marketing in North America is written for chloramine cities, where the disinfectant is chlorine
combined with ammonia and is deliberately harder to remove. Calgary is not one of them.
The practical consequences are all in your favour:
- Standard activated carbon handles free chlorine well. You do not need catalytic carbon media
for Calgary water, and you should not be paying a premium for it on the grounds of chloramine. - Contact time requirements are lower, so a correctly sized system does not need to be
enormous. - It leaves on its own. The City’s own advice for chlorine taste is to fill a jug and put it in
the fridge overnight, because “much of the chlorine will dissipate”. That is free, and for a
household that only dislikes the taste of drinking water, it may be the entire answer.
We would rather you knew that before you spent anything.
So what is a whole home carbon filter actually for?
Taste and smell at every tap, not just the one with a filter under it. A jug in the fridge does
not help the tap you cook with.
Showers and baths. This is the honest reason most people install one. Chlorine is what dries
skin and irritates eyes for people who are sensitive to it, and a drinking water filter under the
kitchen sink does nothing for the shower.
Seasonal taste changes. Calgary’s source water can carry elevated geosmin in late summer and
early autumn, a harmless naturally occurring compound that tastes and smells earthy or musty. The
City confirms it, and activated carbon is the right tool for it. It is also the time of year we get
the most calls about the water tasting strange.
Protecting rubber and elastomers, and protecting softener resin, which is why carbon usually
goes ahead of a softener when a house has both.
Aquariums and some medical uses, where the disinfectant has to come out deliberately.
What it does not do
It does not soften water. Carbon does nothing about hardness, and hardness is Calgary’s real
water problem. On the City’s 2025 figures the Glenmore supply, which feeds the south of the city,
runs roughly 181 to 274 mg/L as calcium carbonate. The Bearspaw supply, which feeds the north, runs
roughly 141 to 200. In US grains per gallon that is about 10.6 to 16.0 in the south and 8.2
to 11.7 in the north. Anything above about 7 is considered hard, so the south of Calgary is hard
water by any standard, and it is harder than the north.
If your complaint is scale on fixtures, spotty glassware, soap that will not rinse, or a hot water
tank that failed early, the answer is a softener, not carbon.
See water softeners.
It does not remove dissolved minerals. For that you want reverse osmosis at the drinking tap.
See reverse osmosis.
It is not a disinfection system. We do not install UV, and Calgary’s municipal supply is
already treated and tested. Anyone selling you home disinfection on city water should be asked
precisely what problem they are solving.
How the three treatments fit together
| Your problem | The right tool |
|---|---|
| Scale, spots, soap that will not rinse, early tank failure | Water softener |
| Chlorine taste and smell at every tap, shower comfort, seasonal musty taste | Whole home carbon |
| Dissolved minerals in the glass, the kettle and the coffee | Reverse osmosis at the drinking tap |
| Chlorine taste in drinking water only, and you are happy to plan ahead | A jug in the fridge overnight, free |
In a house that wants the full set, the usual order is carbon, then softener, then reverse osmosis
at the sink: the carbon protects the softener resin and the softener protects the RO membrane. We
will work out the right arrangement for your house, your incoming water and the space you have.
What we install and service
We are not tied to one manufacturer. We fit and service a wide range of systems, and we will
recommend based on your water, your house and your plumbing rather than on what we happen to stock.
- Whole home carbon filters sized to the household, with the media matched to what is actually
in Calgary water rather than to a brochure written for somewhere else. - Backwashing or cartridge systems, depending on the house, the space, drain availability and
how much maintenance you want to be doing yourself. - Media and cartridge replacement on schedule. Carbon has a finite capacity. Once it is used
up, the filter is a pipe with a housing on it and the taste comes back. Put the change date in
your calendar, or put the system on a maintenance plan so it happens without you thinking about
it. - Bypass and isolation valves, so the system can be serviced without shutting off the house.
We service systems we did not install, including ones bought online and fitted by somebody else.
Being straight about this one
Whole home filtration is a comfort purchase, not a safety purchase. Calgary’s water is treated,
tested and safe to drink. Anyone who opens the conversation by suggesting your tap water is
dangerous is selling fear, and you should be sceptical of them.
What a carbon filter delivers is water that tastes and smells better everywhere in the house, a
shower that is easier on sensitive skin, and less chlorine reaching the seals in your fixtures.
Those are real benefits, worth what they are worth to you.
And if the honest answer for your house is a softener and a jug in the fridge, that is what we will
tell you.
Booking it
Call 403-404-9975.
What is free
An in home water hardness test. Ten minutes, no obligation, and it gives you the number that
should drive most water treatment decisions in this city. If the answer is that you do not need
anything, we will say so.
How we price this work
We charge by the job, not by the hour. You get one number for the finished work, agreed before
anything starts and always in writing. Parts, labour and disposal are in the number you agreed. If
we find something else once we are in, we stop and re-quote, and you decide.
Frequently asked questions
Does Calgary use chlorine or chloramine?
Free chlorine. The City’s water treatment process adds sodium hypochlorite after clarification and a second dose in a step it calls post-chlorination, and the City’s published water quality data reports a free chlorine residual of roughly 0.8 to 2.0 mg/L against a required minimum of 0.2. It is not a chloramine system, which matters because a lot of filter marketing is written for chloramine cities and sells media you do not need here.
What removes chlorine taste from Calgary tap water?
Activated carbon, in any of its forms: a jug filter, an under sink filter, or a whole home unit on the main line. The City’s own advice for drinking water is simpler still: fill a container and refrigerate it overnight, and much of the chlorine dissipates on its own. A whole home filter is for when you want every tap and every shower treated, not just the drinking water.
Do I need catalytic carbon in Calgary?
Not for chlorine. Catalytic carbon exists mainly to deal with chloramine, which Calgary does not use as its disinfectant. Standard activated carbon, correctly sized, handles free chlorine.
Will a carbon filter soften my water?
No. Carbon deals with taste, smell and disinfection byproducts. Hardness needs a softener. On the City’s 2025 figures the south of Calgary runs roughly 181 to 274 mg/L as calcium carbonate, about 10.6 to 16.0 US grains per gallon, which is hard by any standard and harder than the north of the city.
Why does my water taste musty in late summer?
Geosmin, a naturally occurring compound the City reports at elevated levels in the source water in late summer and early autumn. It is harmless and it is a taste and odour issue rather than a safety one. Activated carbon is the right tool for it, and the City suggests a charcoal filter or a jug of water with lemon in the fridge.
Do I need a whole home filter if I already have reverse osmosis?
They do different jobs. Reverse osmosis treats one tap, usually the kitchen. A whole home carbon filter treats every tap and every shower. If your reason for filtering is drinking water, RO is enough. If it is showers, skin, or the smell of the water throughout the house, it is not.
How often does the carbon need replacing?
Carbon has a finite capacity and the interval depends on the size of the system and how much water the household uses. Once it is exhausted, the taste returns. It is worth diarising or putting on a maintenance plan so it happens without you having to remember.
Is Calgary tap water safe to drink?
Yes. It is treated, tested and safe. Whole home filtration is about taste, smell and comfort rather than safety.
Written by Desmond Neufeld, Red Seal Journeyman Plumber and Certified Type B Gasfitter. Last updated 23 August 2026.
