Filter Overview All Products x Brands Katadyn 91 Micropur 2 Steripen 8 Optimus 34 AlpineAire 25 Spectra Watermakers 78 Applications Outdoor 8 Tactical 2 Emergency Preparedness & Relief 4 Solutions Water 8 Effective against Bacteria 1 Cysts 1 Protozoa 1 Virus 1 Water Source Clear Water 7 Tap Water 7 Group Size 1 8 2-5 6 Usage often 8 Find Spare Part Katadyn Steripen Ultralight UV Water Purifier discover Katadyn Steripen Ultra UV Water Purifier discover Katadyn Steripen Adventurer Opti UV Water Purifier discover Katadyn Steripen Classic 3 UV Water Purifier discover Katadyn Steripen FitsAll Filter discover Katadyn Steripen Pre-Filter discover Katadyn Steripen Classic 3 UV Water Purifier -... DISCONTINUED - bundle with pre-filter. Steripen Classic 3 still available. discover Katadyn Steripen Aqua UV Water Purifier - DISCO... DISCONTINUED - we recommend Steripen Classic 3 as a similar model discover