A. O. Smith Direct Flow RO AOS-DFRO800 vs Waterdrop G3P600
Only the Waterdrop G3P600 is certified to reduce PFAS, lead, chlorine and fluoride. Verdict: the Waterdrop G3P600 for broader certified protection (5 vs 1 of the contaminants we track). Replacement filters and water for 2 people cost about $292 a year on the A. O. Smith Direct Flow RO AOS-DFRO800 and $147 on the Waterdrop G3P600; they cost $575 and $539 to buy.
| A. O. Smith Direct Flow RO AOS-DFRO800 | Waterdrop G3P600 | |
|---|---|---|
| Type | Under-sink reverse osmosis | Under-sink reverse osmosis |
| Price | $575 | $539 |
| Filters + water a year (2 people) | $292 | $147 |
| Filter cost per gallon (rated life) | 40¢ | 13¢ |
| Gallons per day | 800 | 600 |
| Pure to drain | 1.78:1 | 2:1 |
| Installation | diy | diy |
| PFAS | — | Certified |
| Lead | — | Certified |
| Chlorine | Brand test only | Certified |
| Fluoride | — | Certified |
| Arsenic | — | Brand test only |
| Chromium 6 | — | Brand test only |
| TDS | Certified | Certified |