The Swiss Katadyn Group is number one in the world in the field of individual water treatment systems and products. Appalachian Outdoors is proud to offer these fine water filters and other Katadyn water treatment products. Katadyn Water Filters are the answer to your water purification needs ? make sure you pick up a Katadyn Filter before your next camping trip, or be ready for anything with a Katadyn Camp Set. Katadyn Microfilter technology is perfect for the hiker or backpacker on the go. Always be sure of your water in the great outdoors with Katadyn!