Katadyn Drip Self-contained water filtering station Suspect water needs worry-free, hasslefree filtration and that’s what you get from this freestanding Katadyn Drip product. No electricity. No pumping. No moving parts. No effort. Just set it up, fill the container, and let gravity pull water through the system. You can confidently treat larger quantities – 4 liters / hour into a 10-liter container – making it a must-have for groups, base camps, huts, cabins or recreation areas. The Drip Ceradyn uses silverimpregnated ceramic elements to clean out bacteria and protozoa; the Drip Gravidyn model adds activated carbon to also reduce chemicals for the extra benefit of better taste and smell.