Express Water
Express Water RO5DX
$189.99Cheaper
Best Reverse Osmosis Systems · head-to-head
Express Water RO5DX vs Brondell Circle RC100
A sourced, side-by-side comparison. Express Water RO5DX is cheaper at $189.99. Every spec and price links to its source.
Brondell
Brondell Circle RC100
$449.99
2 sellers$449.99read
Which is better: the Express Water RO5DX or Brondell Circle RC100?
On the specs we track, they're closely matched. The Express Water RO5DX is the cheaper at $189.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec |  Express Water RO5DX |  Brondell Circle RC100 |
|---|---|---|
| US price | $189.99 | $449.99 |
| Brand | Express Water | Brondell |
| Released | — | — |
| Install type | under-sink | under-sink |
| Filtration stages | 5 | 4 |
| Rated capacity gpd | 50 | — |
| Pure to drain ratio | — | — |
| TDS reduction (%) | — | — |
| Remineralization | No | No |
| Requires electricity | No | No |
| Storage tank (gal) | 3.2 | 1.6 |
| NSF certified standards | 58, 372 | 42, 53, 58, 372 |
| Membrane life months | — | 24 |
| Annual filter cost (USD) | — | — |
Sources — Express Water RO5DX: expresswater.com (verified 2026-10-20). Brondell Circle RC100: brondell.com (verified 2026-10-20).
What's the difference between the Express Water RO5DX and Brondell Circle RC100?
Where the two actually differ on the specs we track (3 of 11). Matching specs are omitted.
- Filtration stages: Express Water RO5DX 5 vs Brondell Circle RC100 4
- Storage tank (gal): Express Water RO5DX 3.2 vs Brondell Circle RC100 1.6
- NSF certified standards: Express Water RO5DX 58, 372 vs Brondell Circle RC100 42, 53, 58, 372