Add Ons
Pure Alkaline Filter
Puts the good minerals back after RO takes everything out.
Reverse osmosis is thorough — it strips beneficial minerals along with the contaminants. The alkaline filter adds calcium and magnesium back in, which is what makes water taste like spring water instead of flat. Pairs with either RO system.
Best for: Anyone who finds plain RO water tastes flat
What you get
Features
- Restores calcium and magnesium removed by RO
- Noticeably better taste in water, coffee and tea
- Installs inline with your existing RO system
- Simple cartridge replacement
Full specifications
Key specifications
| Type | Inline remineralization cartridge |
|---|---|
| Function | Restores calcium and magnesium removed by RO |
| Installs | Inline, after the RO membrane |
| Pairs with | HW800 AlkaPro (built in) or the 5-stage tank RO |
| Filter changes | Simple cartridge replacement |
Warranty
| Media warranty | 5 years |
|---|---|
| Labor warranty | 1 year from date of purchase |
What it adds back
- Calcium
- Magnesium
- A noticeably fuller taste in water, coffee and tea
- Balanced pH rather than flat, stripped water
Warranty on this system
- Lifetime
- Tanks, ceramic discs and dry parts
- 5 years
- Control valve, circuit board and media
- 1 year
- Installation labor
Specifications from the manufacturer’s documentation. Component brands and certifications are those of their respective manufacturers.
Watch
Reverse osmosis at the kitchen sink
What reverse osmosis removes that a whole-home system can't, and why it goes at the drinking tap. From the /lp/single-faucet-ro landing page.
More photos
A closer look
Also in add ons
Reviews
From people who had one installed
“Really happy with the water softener install. Peter was friendly, explained everything in normal language, and didn’t rush. The water feels so much better now. Wish I’d done this sooner”
Ejaz AnsariGoogle review · Nov 2025“Pete was exceptional! Great guy and did a fantastic job with the installation and explanation of how the system works. 10/10 would recommend to anyone looking for softening and filtration systems for their home.”
Aaron AdamsGoogle review · Nov 2025“Had Peter come out to help up set up our new water softener. He did an excellent job, completely explained the system, and was very respectful and finished in a timely manner. Very happy with our new product”
Shri K. GowrishGoogle review · Nov 2025Free water test
Find out what's actually in your water
We'll test your water at your kitchen sink, show you the result, and tell you what — if anything — you need. Free, and there's no system that fits every house.
- Free on-site water test
- Free installation
- Lifetime warranty