A. O. Smith Direct Flow RO AOS-DFRO800 vs Aquasana SmartFlow RO
Only the Aquasana SmartFlow RO is certified to reduce PFAS, lead, chlorine and chloramine and 9 more. Verdict: the Aquasana SmartFlow RO for broader certified protection (14 vs 1 of the contaminants we track); the A. O. Smith Direct Flow RO AOS-DFRO800 if running cost matters more. Replacement filters and water for 2 people cost about $292 a year on the A. O. Smith Direct Flow RO AOS-DFRO800 and $321 on the Aquasana SmartFlow RO; they cost $575 and $480 to buy.
| A. O. Smith Direct Flow RO AOS-DFRO800 | Aquasana SmartFlow RO | |
|---|---|---|
| Type | Under-sink reverse osmosis | Under-sink reverse osmosis |
| Price | $575 | $480 |
| Filters + water a year (2 people) | $292 | $321 |
| Filter cost per gallon (rated life) | 40¢ | — |
| Gallons per day | 800 | 25.7 |
| Pure to drain | 1.78:1 | 0.38:1 |
| Installation | diy | diy |
| PFAS | — | Certified |
| Lead | — | Certified |
| Chlorine | Brand test only | Certified |
| Chloramine | — | Certified |
| Fluoride | — | Certified |
| Arsenic | — | Certified |
| Nitrate | — | Certified |
| Chromium 6 | — | Certified |
| Mercury | — | Certified |
| Microplastics | — | Certified |
| Cysts | — | Certified |
| VOCs | — | Certified |
| TDS | Certified | Certified |
| Copper | — | Certified |