MSR AutoFlow Replacement Filter Cartridge for AutoFlow XL – Hollow-Fiber, Field-Maintainable 1.75 L/min

If your MSR AutoFlow Gravity Filter has slowed or is passing more sediment than usual, swapping in a fresh MSR AutoFlow Replacement Filter Cartridge returns the system to near-new flow rates and filtration capability. The cartridge uses hollow-fiber membrane technology, is field-maintainable with routine backflushing, and is sized to fit the AutoFlow XL series. It’s a compact, USA-made spare designed to be carried on extended trips or kept as a maintenance item at home.

How quickly will this cartridge restore my AutoFlow’s flow rate?

When installed and maintained with regular backflushing, the replacement cartridge brings the AutoFlow back to its designed flow performance—about 1.75 liters per minute under normal gravity conditions. Flow depends on head pressure and water clarity, but a new cartridge eliminates the most common cause of reduced throughput: clogged hollow fibers.

• Designed flow rate: approximately 1.75 L/min with proper head pressure
• Works as a direct replacement for AutoFlow XL gravity housings
• Backflushing recommended to sustain performance

What level of contamination does the hollow-fiber media block?

The hollow-fiber membrane is manufactured and tested to meet established guide standards for microbial removal; it targets bacteria and protozoa by physical filtration rather than chemicals. These membranes trap particulates inside the fiber lumens so cleaned water flows out by gravity.

• Hollow-fiber technology for mechanical removal of particulates
• Manufactured and tested to recognized filtration protocols for bacteria and protozoa
• No chemical additives required—filtering is purely mechanical

How long will one cartridge last in the field?

The cartridge has an expected service life of roughly 1,500 liters under typical use before replacement is recommended. Longevity varies with source water quality and maintenance frequency; frequent backflushing extends usable lifetime and keeps flow rates higher for longer.

• Estimated lifespan: about 1,500 L of treated water
• Lightweight: approximately 2 ounces for easy spares
• Dimensions: about 6 inches by 2 inches for compact storage

How do I maintain and install the replacement cartridge?

Installation is straightforward—remove the worn cartridge from the AutoFlow housing and insert the new MSR unit following the system’s instructions. Routine field maintenance consists of backflushing with clean water to dislodge trapped sediment and preserve flow; no specialized tools are needed.

• Field-maintainable with regular backflushing to clear fiber clogs
• Simple swap-in installation for AutoFlow XL housings
• Compact spare to carry on multi-day trips or keep for seasonal maintenance

Who this replacement cartridge is for: paddlers, backpackers, family-campers, and backcountry trip leaders who use the MSR AutoFlow Gravity Filter and want a lightweight, proven spare or maintenance replacement. It’s also suited for households that rely on their AutoFlow system seasonally and want to restore reliable flow without replacing the entire filter housing. Made in the USA and updated for modern use, this cartridge keeps your AutoFlow working efficiently with minimal effort.