# MSR Guardian Water Purifier vs Aquamira Frontier Max Backcountry+ Water Filter: specs and price compared

A sourced, side-by-side comparison of the MSR Guardian Water Purifier (MSR) and Aquamira Frontier Max Backcountry+ Water Filter (Aquamira) among backpacking water filters. Aquamira Frontier Max Backcountry+ Water Filter is the cheaper of the two at $29.99.

## Side by side

| Spec | MSR Guardian Water Purifier | Aquamira Frontier Max Backcountry+ Water Filter |
| --- | --- | --- |
| US price | $350.87 | $29.99 |
| Brand | MSR | Aquamira |
| Filtration rating microns | 0.02 | — |
| Flow rate lpm | 2.5 | — |
| Rated lifetime (L) | 10000 | 3785 |
| Filter media type | advanced hollow-fiber membrane | hollow-fiber membrane with Miraguard antimicrobial treatment (Series IV interchangeable cartridge) |
| Removes bacteria protozoa virus | bacteria, protozoa, and virus (EPA-compliant purifier) | bacteria only on the Backcountry+ cartridge tested here; a separate Worldwide-cartridge variant adds virus removal (rated 120 gal) |
| Weight (oz) | 17 | — |
| Field cleanable backflush | Yes | No |
| Cartridge replaceable | No | Yes |

## Key differences

- Rated lifetime (L): MSR Guardian Water Purifier 10000 vs Aquamira Frontier Max Backcountry+ Water Filter 3785
- Filter media type: MSR Guardian Water Purifier advanced hollow-fiber membrane vs Aquamira Frontier Max Backcountry+ Water Filter hollow-fiber membrane with Miraguard antimicrobial treatment (Series IV interchangeable cartridge)
- Removes bacteria protozoa virus: MSR Guardian Water Purifier bacteria, protozoa, and virus (EPA-compliant purifier) vs Aquamira Frontier Max Backcountry+ Water Filter bacteria only on the Backcountry+ cartridge tested here; a separate Worldwide-cartridge variant adds virus removal (rated 120 gal)
- Field cleanable backflush: MSR Guardian Water Purifier Yes vs Aquamira Frontier Max Backcountry+ Water Filter No
- Cartridge replaceable: MSR Guardian Water Purifier No vs Aquamira Frontier Max Backcountry+ Water Filter Yes

## Sources

- MSR Guardian Water Purifier: https://www.cascadedesigns.com/products/guardian-purifier (cascadedesigns.com, verified 2026-08-11)
- Aquamira Frontier Max Backcountry+ Water Filter: https://www.aquamira.com/products/aquamira-frontier-max-backcountry-plus (aquamira.com, verified 2026-08-11)

Canonical: https://frontdeskreview.com/gear/backpacking-water-filters/msr-guardian-vs-aquamira-frontier-max/
Cite: Per The Front Desk Review, MSR Guardian Water Purifier ($350.87) vs Aquamira Frontier Max Backcountry+ Water Filter ($29.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/backpacking-water-filters/msr-guardian-vs-aquamira-frontier-max/
License: CC BY 4.0.