Aquasana · Under-sink reverse osmosis
Aquasana SmartFlow RO: what it removes and what it costs
Model: SmartFlow Reverse Osmosis (AQ-SFRO2)
The Aquasana SmartFlow RO is certified (NSF/ANSI 58, NSF/ANSI 53, NSF/ANSI 42 and NSF/ANSI 401) to reduce PFAS (PFOA), lead, chlorine, chloramine, fluoride and arsenic and 8 more of the contaminants we track. For 2 people drinking and cooking with it, replacement filters cost about $310 a year, and it sends about 538 gallons a year to the drain.
14
certified reductions we track
—
filters per gallon at rated life
Price checked 2026-10-23. We may earn a commission.
What the Aquasana SmartFlow RO removes
"Certified" means a certifier (NSF, WQA, IAPMO or CSA) lists this exact product for that reduction claim; the listing is linked. "Brand test only" means Aquasana cites a lab report but no certifier lists the claim. See certified vs. tested.
| Contaminant | Status | Evidence |
|---|---|---|
| PFAS | Certified | WQA listing, NSF/ANSI 53 ("PFOA") |
| Lead | Certified | WQA listing, NSF/ANSI 53 ("Lead") |
| Chlorine | Certified | WQA listing, NSF/ANSI 42 ("Chlorine") |
| Chloramine | Certified | WQA listing, NSF/ANSI 42 ("Chloramine") |
| Fluoride | Certified | WQA listing, NSF/ANSI 58 ("Fluoride") |
| Arsenic | Certified | WQA listing, NSF/ANSI 58 ("Arsenic V (50 ppb)") |
| Nitrate | Certified | WQA listing, NSF/ANSI 58 ("Nitrate") |
| Chromium 6 | Certified | WQA listing, NSF/ANSI 58 ("Hexavalent Chromium") |
| Mercury | Certified | WQA listing, NSF/ANSI 53 ("Mercury") |
| Microplastics | Certified | WQA listing, NSF/ANSI 401 ("Microplastics") |
| Cysts | Certified | WQA listing, NSF/ANSI 53 ("Cyst") |
| VOCs | Certified | WQA listing, NSF/ANSI 53 ("VOC") |
| TDS | Certified | WQA listing, NSF/ANSI 58 ("TDS") |
| Copper | Certified | WQA listing, NSF/ANSI 58 ("Copper") |
Not verified, either way (no certification or brand claim): Bacteria and viruses, Iron, Uranium, 1,4-dioxane.
What it costs to run
Yearly cost = replacements per year × filter price, for each filter it uses; a filter is replaced at its gallon rating or its month limit, whichever comes first, plus the water sent to the drain at an average water and sewer price. Water use: drinking and cooking water (0.28 gallons per person a day, EPA's average adult intake).
| Household | Gallons a year | Filters a year | Drain water | Total a year | Per gallon |
|---|---|---|---|---|---|
| 1 person | 102 | $310 | 269 gal ($6) | $316 | 309¢ |
| 2 people | 204 | $310 | 538 gal ($11) | $321 | 157¢ |
| 4 people | 409 | $310 | 1,076 gal ($23) | $333 | 81¢ |
Rated production is 25.7 gallons a day; 2 people need about 0.56 — well within it. Colder water and lower pressure reduce actual output.
Replacement filters
| Filter | Rated life (gallons) | Rated life (months) | Price |
|---|---|---|---|
| AQ-SFRO-S1S3 carbon block + advanced carbon block (stages 1 & 3) | 250 Source note | 6 Source note | $91.99 Source noteWater for Life price $78.19 aquasana.com |
| AQ-SFRO-S2 SmartFlow RO membrane | — Source note | 12 Source note | $62.99 Source note |
| AQ-SFRO-REMIN remineralizer | — Source note | 6 Source note | $31.49 Source note |
Specs
- Type
- Under-sink reverse osmosis
- Price
- $480
Source note
MSRP $479.99 (brushed nickel); sale $239.99 (50% off). Chrome: MSRP $449.99 / sale $224.99, out of stock. BN shows 'Delayed Shipping' to 10/27/26 aquasana.com
- Installation
- DIY (under-sink or inline fittings)
- Rated production
- 25.7 gallons per day
Source note
Brand spec: daily production rate 25.7 gal; membrane production 51.4 gpd aquasana.com
- Pure to drain
- 0.38:1 est.
Source note
Derived from PDS efficiency rating 27.4% (27.4/72.6); recovery rating 42.8%. Brand gives no ratio aquasana.com
- Flow rate
- 0.7 gal/min
Source note
- Needs power
- No
- Remineralization
- Yes
Compare the Aquasana SmartFlow RO
Updates about the Aquasana SmartFlow RO
- August 3, 2026 · EPA publishes protocol for its fluoride toxicity review
Common questions
What does the Aquasana SmartFlow RO remove?
The Aquasana SmartFlow RO is certified (NSF/ANSI 58, NSF/ANSI 53, NSF/ANSI 42 and NSF/ANSI 401) to reduce PFAS (PFOA), lead, chlorine, chloramine, fluoride and arsenic and 8 more of the contaminants we track. For 2 people drinking and cooking with it, replacement filters cost about $310 a year, and it sends about 538 gallons a year to the drain.
Does the Aquasana SmartFlow RO remove PFAS?
Yes. It is certified for PFOA reduction under NSF/ANSI 53 (WQA listing).
How much does the Aquasana SmartFlow RO cost to run?
About $321 a year for 2 people ($316 for 1, $333 for 4), counting replacement filters and the water sent to the drain, for drinking and cooking water (0.28 gallons per person a day, EPA's average adult intake).
Data checked 2026-10-23. 102 filters tracked.