For a small household that wants a certified tank RO system at a low price. Larger families should look at the ROES-100.
Amazon $179.99
For a buyer who wants mineralized water at a low price. The RO5DX is the safer pick if certification matters.
- 100 gallons a dayOutput
- $143 a yearFilters
- NoNSF/ANSI 58
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
- Adds minerals back for taste
- Faster 100 gallon a day membrane refills the tank sooner
- Includes a leak stop valve
- Not certified to NSF/ANSI 58, despite the listing title
- Drain ratio and tank size are not published
- One year warranty
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | ROALK10MBN |
|---|---|
| Filtration | |
| Output | 100 gallons a day |
| Stages | 10 |
| Remineralization | Yes |
| NSF/ANSI 58 | No |
| Other certifications | NSF/ANSI 372 |
| Replacement filters | $143 a year |
| Build | |
| Booster pump | No |
| Smart faucet | No |
| Warranty | 1 year |
Alternatives in this type
For buyers who want a certified tank RO system with remineralization at a low price and can accept high water waste.
Amazon $189.99For someone who wants low water waste and mineralized water without needing an outlet. Buyers who want an NSF/ANSI 58 certification should look elsewhere.
Amazon $419.90Compare
Compare the Express Water ROALK10MBN with any other under-sink reverse osmosis system →
More from Express Water: every Express Water product ranked.