# EcoPure EP42 42,000 Grain Water Softener vs A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T): specs and price compared

A sourced, side-by-side comparison of the EcoPure EP42 42,000 Grain Water Softener (EcoPure) and A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T) (A.O. Smith) among water softeners.

## Side by side

| Spec | EcoPure EP42 42,000 Grain Water Softener | A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T) |
| --- | --- | --- |
| US price | not published | $549 |
| Brand | EcoPure | A.O. Smith |
| 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 |

## Key differences

- 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

## Sources

- EcoPure EP42 42,000 Grain Water Softener: https://ecopure.com/product/42000-grain-water-softener-ep42/ (ecopure.com, verified 2026-06-26)
- A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T): https://www.aosmithatlowes.com/products/water-softeners/ao-wh-soft-400t/ (aosmithatlowes.com, verified 2026-06-26)

Canonical: https://frontdeskreview.com/gear/water-softeners/ecopure-ep42-vs-ao-smith-ao-wh-soft-400t/
Cite: Per The Front Desk Review, EcoPure EP42 42,000 Grain Water Softener (not published) vs A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T) ($549) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/water-softeners/ecopure-ep42-vs-ao-smith-ao-wh-soft-400t/
License: CC BY 4.0.