EcoPure
EcoPure EP42 42,000 Grain Water Softener
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Best Water Softeners · head-to-head
EcoPure EP42 42,000 Grain Water Softener vs A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T)
A sourced, side-by-side comparison. A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T) is cheaper at $549. Every spec and price links to its source.
A.O. Smith
A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T)
$549
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec |  EcoPure EP42 42,000 Grain Water Softener |  A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T) |
|---|---|---|
| US price | — | $549 |
| Brand | EcoPure | A.O. Smith |
| Released | — | — |
| Grain capacity | 42 | 40 |
| System type | ion-exchange | ion-exchange |
| Flow rate (gpm) | — | — |
| Salt efficiency lbs per kgrains | — | — |
| Iron removal (ppm) | 11 | 10 |
| NSF certifications | NSF Certified | — |
| Smart app control | No | No |
| Tank warranty years | 10 | 10 |
| Msrp (USD) | — | 549 |
Sources — EcoPure EP42 42,000 Grain Water Softener: ecopure.com (verified 2026-06-26). A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T): aosmithatlowes.com (verified 2026-06-26).
What's the difference between the EcoPure EP42 42,000 Grain Water Softener and A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T)?
Where the two actually differ on the specs we track (2 of 9). Matching specs are omitted.
- Grain capacity: EcoPure EP42 42,000 Grain Water Softener 42 vs A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T) 40
- Iron removal (ppm): EcoPure EP42 42,000 Grain Water Softener 11 vs A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T) 10