# Express Water RO5DX vs Brondell Circle RC100: specs and price compared

A sourced, side-by-side comparison of the Express Water RO5DX (Express Water) and Brondell Circle RC100 (Brondell) among reverse osmosis systems. Express Water RO5DX is the cheaper of the two at $189.99.

## Side by side

| Spec | Express Water RO5DX | Brondell Circle RC100 |
| --- | --- | --- |
| US price | $189.99 | $449.99 |
| Brand | Express Water | Brondell |
| Install type | under-sink | under-sink |
| Filtration stages | 5 | 4 |
| Rated capacity gpd | 50 | — |
| Pure to drain ratio | — | — |
| TDS reduction pct | — | — |
| 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 | — | — |

## Key differences

- 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

## Sources

- Express Water RO5DX: https://www.expresswater.com/products/ro-system-ro5dx-with-free-filter-set (expresswater.com, verified 2026-07-11)
- Brondell Circle RC100: https://www.brondell.com/circle-reverse-osmosis-water-filter-system/ (brondell.com, verified 2026-07-11)

Canonical: https://frontdeskreview.com/gear/reverse-osmosis-systems/express-water-ro5dx-vs-brondell-circle-rc100/
Cite: Per The Front Desk Review, Express Water RO5DX ($189.99) vs Brondell Circle RC100 ($449.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/reverse-osmosis-systems/express-water-ro5dx-vs-brondell-circle-rc100/
License: CC BY 4.0.