# GRAYL GeoPress 24oz Water Purifier vs Aquamira Frontier Max Backcountry+ Water Filter: specs and price compared

A sourced, side-by-side comparison of the GRAYL GeoPress 24oz Water Purifier (Grayl) 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 | GRAYL GeoPress 24oz Water Purifier | Aquamira Frontier Max Backcountry+ Water Filter |
| --- | --- | --- |
| US price | $99.95 | $29.99 |
| Brand | Grayl | Aquamira |
| Filtration rating microns | — | — |
| Flow rate lpm | 5.3 | — |
| Rated lifetime (L) | 250 | 3785 |
| Filter media type | electroadsorption + ultra-powdered activated carbon (purifier cartridge) | 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) | 15.9 | — |
| Field cleanable backflush | No | No |
| Cartridge replaceable | Yes | Yes |

## Key differences

- Rated lifetime (L): GRAYL GeoPress 24oz Water Purifier 250 vs Aquamira Frontier Max Backcountry+ Water Filter 3785
- Filter media type: GRAYL GeoPress 24oz Water Purifier electroadsorption + ultra-powdered activated carbon (purifier cartridge) vs Aquamira Frontier Max Backcountry+ Water Filter hollow-fiber membrane with Miraguard antimicrobial treatment (Series IV interchangeable cartridge)
- Removes bacteria protozoa virus: GRAYL GeoPress 24oz 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)

## Sources

- GRAYL GeoPress 24oz Water Purifier: https://grayl.com/collections/featured-collection/products/24oz-geopress-filter-purifier-water-bottle-nature-edition (grayl.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/grayl-geopress-vs-aquamira-frontier-max/
Cite: Per The Front Desk Review, GRAYL GeoPress 24oz Water Purifier ($99.95) vs Aquamira Frontier Max Backcountry+ Water Filter ($29.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/backpacking-water-filters/grayl-geopress-vs-aquamira-frontier-max/
License: CC BY 4.0.