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I've got the 4L version, It works great but, I did have a problem with the clean bag just having an opening for the water so I had no control of how much came out and how fast. so I just went out and got one of the water bottle pour cap things.
also, and im sure this is the most Obvious advice I can give about it but. when you are filtering from dirty bag to clean bag, leave the top of the dirty bag open and it will filter 10x faster.