H2O-105 under sink water filter
Cleaner drinking water at your kitchen sink. [Confirm specs.]
A compact under-sink filter for cleaner drinking and cooking water at the kitchen sink. [Partner to confirm stages and specs.]
- Licensed install
- 30-day money-back guarantee
Want the answer for your home?
Tell us your ZIP code and a rep calls you within 5 minutes to answer every question. No pressure, no sales visit.
You're probably on this page because:
- Your tap water tastes off
- You want a simple under-sink filter
Better water at the sink.
Drinking water, by the numbers
- 4 parts per trillion: the EPA's 2024 limit for PFOA and PFOS.
- 59% of people are concerned about their water quality.
Sources: EPA; WQA 2025 via WCP.
Want clean water at every tap, not just the sink?
RO fixes your drinking water. A whole-house system fixes every shower, faucet and appliance too.
Our City Water System includes this RO plus a whole-house softener and carbon filter: $2,950 installed.
Savings in year one, and every year after
$414
- 10-year total
- $4,136
- Pays for the City Water System
- 1.4 times over 10 years
- Water heater energy
- $130
- Detergent and cleaning
- $144
- Appliances and fixtures
- $140
- Bottled water (with RO)
- $0
An estimate, not a guarantee. Your numbers depend on your water, your home and your habits. Enter your ZIP code to use your local hardness; until then it assumes 10 grains.
Sources: Water heater efficiency: WQRF and Battelle (gas tank heaters lost up to 48% efficiency on hard water; the calculator uses a conservative middle value). Detergent: WQRF laundry and dishwasher studies (about 30% less at 10 gpg, nearly 70% less at 25 gpg). Fixtures: Battelle (low-flow shower heads clogged in about 18 months on hard water). Appliance figures are our own conservative estimate until customer data replaces them.
Comes with
- Licensed local plumber install
- Before-and-after water test
- 30-day money-back guarantee on the system
- Warranty: [product terms] + 1 year on labor
- Filter subscription option: new filters every 6 months
Part of the City Water System
$2,950 installed, with everything it takes to put it in.
Specs
- Stages / media
- [confirm]
- Flow or gallons per day
- [confirm]
- Filter life
- [confirm]
- Certified to remove
- [NSF/ANSI listings]
- Warranty
- [confirm]
Schedule a Call
Life with it vs. without
| Without it | With it |
|---|---|
| Off-tasting water | Clean drinking water |
How we work, start to finish
- 1
You reach out or book online
- 2
A rep calls you, usually within 5 minutes, to confirm your system and answer questions
- 3
We schedule a licensed local plumber, usually within a week
- 4
Install day: a few hours, plus a before-and-after water test
- 5
After that: new filters every 6 months if you subscribe
Our take
Why we install the H2O-105
Working directly with our manufacturers, and holding our own patents, has taught us exactly where filters succeed and fail.
[Owner input: why this model was chosen, what makes it different from cheaper versions, any patents or design choices, and real install experience with it.]
Every model page needs at least 200 words here in our own words. Cover: who it's right for (and who it isn't), what it's certified to remove, what installers notice about it, how long the filters really last in Florida and Texas water, and one tip most people don't know. This is what makes the page ours instead of a copied spec sheet.
Designed with our own manufacturers
[One line on this model and any patent.]
- 20+ years in water
- Our own patents
- We supply other water companies
- [Thousands] of systems sold
- Licensed installers
Related Pages
Questions people ask
What does it remove?
[Confirm certified reductions.] We only claim what it's certified for.
How often do I change the filters?
[Confirm schedule.] The filter subscription sends them automatically.
Does it need its own faucet?
[Confirm.]
How much water does it make a day?
About [X] gallons a day, plenty for drinking and cooking.
Who installs it?
A licensed local plumber, included in your price.
Is it covered by the guarantee?
Yes, 30-day money-back guarantee on the system.
Want the Answer for Your Home?
Tell us your ZIP code and a rep calls you within 5 minutes to answer every question. No pressure, no sales visit.