A. O. Smith Direct Flow RO AOS-DFRO800 vs Frizzlife PD800-TAM4
Only the A. O. Smith Direct Flow RO AOS-DFRO800 is certified to reduce TDS. Verdict: the A. O. Smith Direct Flow RO AOS-DFRO800 for broader certified protection (1 vs 0 of the contaminants we track); the Frizzlife PD800-TAM4 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 $111 on the Frizzlife PD800-TAM4; they cost $575 and $650 to buy.
| A. O. Smith Direct Flow RO AOS-DFRO800 | Frizzlife PD800-TAM4 | |
|---|---|---|
| Type | Under-sink reverse osmosis | Under-sink reverse osmosis |
| Price | $575 | $650 |
| Filters + water a year (2 people) | $292 | $111 |
| Filter cost per gallon (rated life) | 40¢ | 12¢ |
| Gallons per day | 800 | 800 |
| Pure to drain | 1.78:1 | 2:1 |
| Installation | diy | diy |
| PFAS | — | Brand test only |
| Lead | — | Brand test only |
| Chlorine | Brand test only | Brand test only |
| Fluoride | — | Brand test only |
| Arsenic | — | Brand test only |
| Nitrate | — | Brand test only |
| Chromium 6 | — | Brand test only |
| Mercury | — | Brand test only |
| TDS | Certified | Brand test only |
| Copper | — | Brand test only |