Having a patented fail-safe filtration technology is what makes the LIFESAVER bottle so popular. The LIFESAVER LSB4RC Bottle 4000 Ultra Filtration Cartridge is a highly advanced filtration system first developed for industrial applications. This filter removes parasites, bacteria, viruses, cysts, and other waterborne microbiological pathogens from your drinking water. The pump action lets you know when the filter is nearing the end of its life - the more pumps you need for water flow the closer the life of the cartridge is over. Purchase now to enjoy the peace of mind and convenience of safely filtered water.