Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Listings checked Oct. 9, 2026
Certified to
- NSF/ANSI 42WQA listingchecked Oct. 9, 2026
- NSF/ANSI 53WQA listingchecked Oct. 9, 2026
- NSF/ANSI 58WQA listingchecked Oct. 9, 2026
- NSF/ANSI 401WQA listingchecked Oct. 9, 2026
Certified for: Lead, Copper, PFOA, PFOS, Nitrate, Arsenic, Chromium (total), Fluoride, Chlorine, Chloramine, Total trihalomethanes (TTHM)
- Water to drain
- 27.4% efficiency (maker figure)
Maker’s list price
$450
as of Oct. 9, 2026
Each replacement, at list price
- Carbon block and advanced carbon block set (AQ-SFRO-S1S3)
- $92
- RO membrane (AQ-SFRO-S2)
- $63
- Remineralizer (AQ-SFRO-REMIN)
- $31
Five years, household of 3
$2,917
53¢ per gallon
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List price from the maker’s site, checked Oct. 9, 2026. Prices change; the maker’s page is the final word.
What the listings say
| Standard | Certifier | Claims | Listing |
|---|---|---|---|
| NSF/ANSI 42 | WQA | Aesthetic Chloramine; Aesthetic Chlorine; Nominal Particulate Class I; Taste and Odor | Read the listing checked Oct. 9, 2026 |
| NSF/ANSI 53 | WQA | Asbestos; Cyst; Lead; Mercury; Methyl Tert-Butyl Ether (MTBE); Perfluorooctane Sulfonate (PFOS); Perfluorooctanoic Acid (PFOA); VOC (as chloroform) | Read the listing checked Oct. 9, 2026 |
| NSF/ANSI 58 | WQA | Arsenic (V) (50 ppb influent level); Barium; Cadmium; Copper; Fluoride; Hexavalent Chromium; Nitrate; Nitrite; Radium 226/228; Selenium; TDS; Trivalent Chromium; Turbidity | Read the listing checked Oct. 9, 2026 |
| NSF/ANSI 401 | WQA | Atenolol; Bisphenol A; Carbamazepine; DEET; Estrone; Ibuprofen; Linuron; Meprobamate; Metolachlor; Microplastics; Naproxen; Nonyl Phenol; Phenytoin; TCEP; TCPP; Trimethoprim | Read the listing checked Oct. 9, 2026 |
Certified for, and claimed
Certified, by a listing
Claimed by the maker only
None recorded.
What it costs over five years
Household of 3, 3 gallons a day of drinking and cooking water. Installation not included.
| Item | Replaced | Count | Amount |
|---|---|---|---|
| System, with first media | — | 1 | $450 |
| Carbon block and advanced carbon block set (AQ-SFRO-S1S3) | Every 3 monthsgallon rating runs out first | 21 | $1,932 |
| RO membrane (AQ-SFRO-S2) | Every 12 monthsmonth rating | 4 | $252 |
| Remineralizer (AQ-SFRO-REMIN) | Every 6 monthsmonth rating | 9 | $283 |
Five-year total$2,917
Per gallon53¢
Worth knowing
With a storage tank. Replaces the OptimH2O (AQ-RO-3). Price recorded is the $449.99 MSRP with a chrome faucet; other finishes are $479.99, and Aquasana showed $224.99 for chrome on Oct. 9, 2026. The efficiency rating is from its performance data sheet; Aquasana states no drain ratio. The Amazon page is the brushed nickel version.
Where to go next
- Every reverse osmosis system, rankedBy what their listings cover, then what each costs over five years.The best reverse osmosis systems, ranked
- Your household’s costThe five-year cost at your own household size and daily use.Run it for your household
- NSF/ANSI 42, decodedWhat a NSF/ANSI 42 listing does and does not promise.About NSF/ANSI 42
- Every filter, checkedSide by side, with what each one can prove.All filters