bombinbrian: "I took an old filter from our Katadyn and drilled it out so there is no filtration in it. I use it with a sawyer inline filter with it when my bag filter slows down or quits flowing "
Did the same to my Katadyn and put a Sawyer mini attached to the hose outside the bag. Worked great on our trip last week and we were dealing with cotton and pollen throughout the water. For pics on how to convert your Katadyn to use the Sawyer mini check out the search mode. We were going through Katadyn filters like crazy before the conversion.