Rick W.wrote a review of Katadyn Gravity Camp 6L Water Filter on November 9, 2016
Familiarity: I've used it once or twice and have initial impressions
We used this with a group of 5 for a 2 night backpacking trip. Water was from a low stream at both camps. We actually used a pump filter to transfer into this large 6Liter base camp filter. This allowed us to not disturb the water source creating a muddy mess. We benefited by making less trips to filter water and it was nice to have a large amount of "community water" for us to use in camp. Along the trail we had better water sources which allowed for a relaxing break as we loaded up on clean water.
I would definitely recommend this, especially for groups of 3 or more. You may still want a pump filter in your group if it's smaller water sources.