A. O. Smith Direct Flow RO AOS-DFRO800 vs iSpring RO500AK-BN
The A. O. Smith Direct Flow RO AOS-DFRO800 and iSpring RO500AK-BN are certified for the same 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 $198 on the iSpring RO500AK-BN; they cost $575 and $693 to buy.
| A. O. Smith Direct Flow RO AOS-DFRO800 | iSpring RO500AK-BN | |
|---|---|---|
| Type | Under-sink reverse osmosis | Under-sink reverse osmosis |
| Price | $575 | $693 |
| Filters + water a year (2 people) | $292 | $198 |
| Filter cost per gallon (rated life) | 40¢ | — |
| Gallons per day | 800 | 500 |
| Pure to drain | 1.78:1 | 2:1 |
| Installation | diy | diy |
| Lead | — | Brand test only |
| Chlorine | Brand test only | Brand test only |
| Fluoride | — | Brand test only |
| Arsenic | — | Brand test only |
| TDS | Certified | Certified |