iSpring
iSpring RCC7AK
$229.99
Best Reverse Osmosis Systems · head-to-head
iSpring RCC7AK vs Express Water RO5DX
A sourced, side-by-side comparison. Express Water RO5DX is cheaper at $189.99. Every spec and price links to its source.
Express Water
Express Water RO5DX
$189.99Cheaper
Which is better: the iSpring RCC7AK or Express Water RO5DX?
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 |  iSpring RCC7AK |  Express Water RO5DX |
|---|---|---|
| US price | $229.99 | $189.99 |
| Brand | iSpring | Express Water |
| Released | — | — |
| Install type | under-sink | under-sink |
| Filtration stages | 6 | 5 |
| Rated capacity gpd | 75 | 50 |
| Pure to drain ratio | — | — |
| TDS reduction (%) | 97.9 | — |
| Remineralization | Yes | No |
| Requires electricity | No | No |
| Storage tank (gal) | 3.2 | 3.2 |
| NSF certified standards | 58 | 58, 372 |
| Membrane life months | — | — |
| Annual filter cost (USD) | 80.99 | — |
Sources — iSpring RCC7AK: ispringfilter.com (verified 2026-10-01). Express Water RO5DX: expresswater.com (verified 2026-10-20).
What's the difference between the iSpring RCC7AK and Express Water RO5DX?
Where the two actually differ on the specs we track (4 of 11). Matching specs are omitted.
- Filtration stages: iSpring RCC7AK 6 vs Express Water RO5DX 5
- Rated capacity gpd: iSpring RCC7AK 75 vs Express Water RO5DX 50
- Remineralization: iSpring RCC7AK true vs Express Water RO5DX false
- NSF certified standards: iSpring RCC7AK 58 vs Express Water RO5DX 58, 372