The LIFESAVER LSB6RC Replacement Filter Cartridge is designed to be used with the LIFESAVER bottle 6000 model only. Originally designed for industrial applications, this filter is the ultimate in water bottle filtration. It's unique nano-filter removes bacteria, parasites, viruses, cysts, and fungi, without the nasty taste of iodine or chlorine. It's the only filter that will fit the Lifesaver Bottle 6000, and it's the only filter that allows you to drink water from ANY source. Remember to keep one in storage so your never without safe water.