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MSR AutoFlow Gravity Filter Replacement Cartridge



Extend the life of your Autoflow Filter.

Having flow problems? Breathe new life into your Autoflow Gravity Filter with the MSR Autoflow Replacement Cartridge. This cartridge has a life expectancy of up to 1,500 liters depending on water conditions, and it filters nearly two liters of water per minute.

  • Hollow Fiber purifying element
  • Gravity action
  • Compatible with AutoFlow Gravity filter
  • Item #CAS003R

Purifying Element
Hollow Fiber
Recommended Use
AutoFlow Gravity compatible
Manufacturer Warranty
limited 3 years

Tech Specs

California Proposition 65


This product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer. For more information go to

What do you think about this product?


>Rating: 3

Good, not great

We have gone through a filter about every other 10-14 day trip. By the end of its second trip, or its only trip on our recent vacation, it was down to a trickle. The cost really adds up, but it seems many filters have the same issue. I will probably not use it at all in tannined water anymore. By about 12 liters, even after backflushing every 4, it was taking a really long time. Backflushing took quite a bit of effort, squeezing the clean water reservoir like a bagpipe until I got a little trickle instead of intermittent drips; never got a decent flow back. At about 20 liters, we were taking water back to camp in the reservoir bag and letting it hang in camp until it got 4+ liters done, about an hour or more. It works great at filtering, but you might need to factor in time and always carry a spare filter. Tannins seemed to be the big problem in clogging up the works. We have used it on 1-2 week kayak trips, filtering about 8 liters every other day or so. People in our group using other filters had some similar issues. Backflushed it again when we got home; did a 2 liter test with tap water, took 24 minutes , counting the few minutes it took to get the bubbles out and get it flowing.

Sadly, this has been our experience with this same filter as well. Backflushing yields minimal improvement, less than 6 months of frequent use.

>Rating: 5

Great water filter for large groups

I've used it several times

Purchased the MSR Autoflow for a base camping wilderness canoe trip. I used by old Katedyn Base Camp water bag (cut off filter) and connected the MSR in line. This filter provided good, clean filtered water. After to flow slowed (~ gallons), I simply back-flushed the filter and it performed as good as new.


How to Backflush: MSR AutoFlow