I use my Berkey a lot, so have that one down. As for my mini sawyer filter, i tried it out at a retention pond just to see how well it worked and to make sure I was using it proper. It did very well. I always clean my filters after using them and making sure they are good and dry before putting away. I had no ill effects from the retention pond but also have not tried it out in a puddle or ditch. Will have to try it to see how it goes. Though it sounds gross, it is something we need to try because one day that might be what we have to do to get water to drink.
