# MSR Guardian Water Purifier vs GRAYL GeoPress 24oz Water Purifier: specs and price compared

A sourced, side-by-side comparison of the MSR Guardian Water Purifier (MSR) and GRAYL GeoPress 24oz Water Purifier (Grayl) among backpacking water filters. GRAYL GeoPress 24oz Water Purifier is the cheaper of the two at $99.95.

## Side by side

| Spec | MSR Guardian Water Purifier | GRAYL GeoPress 24oz Water Purifier |
| --- | --- | --- |
| US price | $350.87 | $99.95 |
| Brand | MSR | Grayl |
| Filtration rating microns | 0.02 | — |
| Flow rate lpm | 2.5 | 5.3 |
| Rated lifetime (L) | 10000 | 250 |
| Filter media type | advanced hollow-fiber membrane | electroadsorption + ultra-powdered activated carbon (purifier cartridge) |
| Removes bacteria protozoa virus | bacteria, protozoa, and virus (EPA-compliant purifier) | bacteria, protozoa, and virus (EPA-compliant purifier) |
| Weight (oz) | 17 | 15.9 |
| Field cleanable backflush | Yes | No |
| Cartridge replaceable | No | Yes |

## Key differences

- Flow rate lpm: MSR Guardian Water Purifier 2.5 vs GRAYL GeoPress 24oz Water Purifier 5.3
- Rated lifetime (L): MSR Guardian Water Purifier 10000 vs GRAYL GeoPress 24oz Water Purifier 250
- Filter media type: MSR Guardian Water Purifier advanced hollow-fiber membrane vs GRAYL GeoPress 24oz Water Purifier electroadsorption + ultra-powdered activated carbon (purifier cartridge)
- Weight (oz): MSR Guardian Water Purifier 17 vs GRAYL GeoPress 24oz Water Purifier 15.9
- Field cleanable backflush: MSR Guardian Water Purifier Yes vs GRAYL GeoPress 24oz Water Purifier No
- Cartridge replaceable: MSR Guardian Water Purifier No vs GRAYL GeoPress 24oz Water Purifier Yes

## Sources

- MSR Guardian Water Purifier: https://www.cascadedesigns.com/products/guardian-purifier (cascadedesigns.com, verified 2026-08-11)
- 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)

Canonical: https://frontdeskreview.com/gear/backpacking-water-filters/msr-guardian-vs-grayl-geopress/
Cite: Per The Front Desk Review, MSR Guardian Water Purifier ($350.87) vs GRAYL GeoPress 24oz Water Purifier ($99.95) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/backpacking-water-filters/msr-guardian-vs-grayl-geopress/
License: CC BY 4.0.