The best water filtration system for your home depends on where it's installed and where your water comes from. Some systems sit on the main line and treat every tap, some fit under the sink or on the counter as reverse osmosis, and some add UV for well water or pair filtration with a softener. Decide where it goes first.
Search for a home water filter and you'll get everything from a jug to a tank in the garage. The shopping gets easier once you know these systems are sold by where they're installed, not by one big league table.
This list covers ten makers of home water filtration and treatment systems, using what each one's own website says, read on 2 Nov 2026 (as of Nov 2026). It's alphabetical and in no particular order. It's about system types and product lines, not what any system removes, so for test data and certifications go to the maker's own documents.
Home water systems compared
| Tool | Type | Good for |
|---|---|---|
| APEC Water | Reverse osmosis, countertop and whole house systems | Undersink RO series plus whole house softeners |
| Aquasana | Whole house, under sink and countertop filters | Whole house systems filtered by city or well water |
| Bluonics | Whole house UV, well water and RO systems | UV sterilizers and well water solutions, plus air purifiers |
| Crystal Quest | Whole house filters, softeners and RO systems | Whole house RO as well as under-sink RO |
| Culligan | Water treatment through local dealers | Local dealers who test, install and service systems |
| Express Water | Reverse osmosis and whole house filtration systems | RO systems with a which-system quiz |
| Frizzlife | Under sink, RO and countertop water filters | Under sink RO series and faucet filters |
| Home Master | Undersink, sinktop, faucet and whole house filters | A guide-me question flow, city supply or private well |
| SpringWell | Whole house filters, softeners and combo systems | Filtration and softening combined in one system |
| Waterdrop | Reverse osmosis systems and water purifiers | Undersink and countertop RO, plus a bottleless cooler |
Ten water filtration makers and where their systems go
APEC Water
Best for: Choosing within its undersink reverse osmosis line, the Tankless, Ultimate and Essence Series, or a countertop RO system, with whole house softeners listed too.
Aquasana
Best for: Filtering whole house systems by your water type, city or private well, with reverse osmosis, under sink, countertop and shower filters on the same menu.
Bluonics
Best for: Households on well water browsing a whole house ultraviolet sterilizer, high and standard flow filtration and under sink reverse osmosis, with air purifiers sold too.
Crystal Quest
Best for: Comparing placements on one menu: whole house, whole house RO, under-sink reverse osmosis, under sink, countertop, inline, and shower and bath filters.
Culligan
Best for: Anyone who'd rather a local dealer tests the water, installs the system and services it, across softening, reverse osmosis and whole house filtration.
Express Water
Best for: Taking its which-system quiz, then choosing from reverse osmosis systems, including countertop, alkaline and UV models, or whole house systems and softeners.
Frizzlife
Best for: Picking an under sink reverse osmosis system from the PD, PX or M800 series, or a countertop, faucet or whole house pre-filter.
Home Master
Best for: Answering a few guide-me questions about your water source before choosing an undersink, sinktop, faucet or whole house system, or a garden and hydroponics model.
SpringWell
Best for: Getting filtration and softening together, from combo systems that pair a whole house filter with a salt-based softener or a salt-free conditioner.
Waterdrop
Best for: Shopping reverse osmosis by series, the X, G and K undersink lines or the A and M countertop lines, with a bottleless water cooler as well.
Whole house, under sink or on the counter
Here's what a searcher rarely guesses: home filtration is sold by where it's installed. A whole house system sits on the main line. SpringWell sells 'whole home water filtration for city and well water', and Crystal Quest lists a whole house RO system it describes as 'RO for every tap'.
The drinking-water end is smaller. Home Master's menu runs 'UNDERSINK SYSTEMS SINKTOP SYSTEMS FAUCET FILTERS WHOLE HOUSE SYSTEMS', APEC Water sells a countertop RO system alongside its undersink lines, and Waterdrop splits its reverse osmosis range into undersink and countertop series.
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- Whole house: systems on the main line, for every tap in the home.
- Under sink: reverse osmosis systems and filters fitted below the kitchen sink.
- Countertop and faucet: units that sit by the tap or fix onto it.
- UV and softeners: sold as their own systems, or combined with filtration.
City supply, well water and softeners
Your water source changes the shortlist. Aquasana's whole house page asks you to pick city water or well water before it shows you systems, and it lists a well water UV filter. Bluonics sells a whole house ultraviolet sterilizer and a range of well water solutions.
Softening is the other fork. Some makers sell filtration and softening as separate products, and some combine them: one maker here sells combo systems it describes as 'filtration and softening combined for whole-home water quality', and Culligan lists water softening beside reverse osmosis and whole house filtration. If you'd rather not choose alone, look for a chooser: Express Water asks 'Which system is right for you?', and others here have their own quiz or question flow.
Questions before you choose a filtration system
- Is my water from a city supply or a private well?
- Do I want treated water at every tap, or just at the kitchen sink?
- Is there space under the sink, or would a countertop unit suit me better?
- Do I also want a softener, and does the maker sell a combined system?
- Would I rather install it myself or have a local dealer do it?
- What do the maker's own test data and certifications say about the exact model?
Do you make home water filtration systems? Tool makers can ask to be considered for a featured place on this list.
My advice for a home water system
Work out where the system goes before you look at brands. If you want every tap covered, compare whole house systems, and if you're on a private well, look at the makers that ask about well water or list UV. If it's just drinking water you're after, under sink and countertop reverse osmosis are the places to start. And for what any system removes, read the maker's own test data, not the shop banner.
If you're planning work on the house anyway, here are the home improvements that add value. And if you're trying to drink more of the stuff, here's how much water you should drink a day.
Want your tool on this list? Featured spots and reviews here are paid partnerships. Here's how to partner with me.
Frequently asked questions
What's the difference between whole house and under sink filtration?
Where it's installed. On the makers' pages here, whole house systems sit on the main water line for every tap, while under sink systems sit below the kitchen sink at the tap you drink from. Several makers sell both.
Which of these makers have systems for well water?
Several. Pages here show a well water UV filter, a whole house ultraviolet sterilizer, well water combo systems and a well water filter finder quiz. One whole house page asks you to choose city or well water before it shows anything.
Can I get filtration and a water softener in one?
Yes, from some makers. One sells combo systems that pair a filter with a salt-based softener or a salt-free conditioner, and others sell whole house filters and water softeners side by side on the same menu.
Is countertop reverse osmosis an option if I can't fit an under sink unit?
Some makers sell one. Pages on this list show a countertop RO system, countertop RO dispensers and a countertop reverse osmosis system alongside their under sink lines. Check the maker's own page for how each model connects.
Do any of these makers install the system for me?
One on this list works through local dealers: its page says its experts test your water, install the system and provide the service. Others sell systems online, so check the maker's own manuals and installation videos.
Which of these also sell a bottleless water cooler?
Two do. One lists a bottleless water cooler in its RO menu, and another lists bottleless water coolers beside its home softening and filtration.
