Propur Prosip Water Filter Straw ( Removes Fluoride! ) Emergency Survival Cleaner Water! Removes Fluoride, Chlorine, Lead, Mercury, Aluminum, Hydrogen Sulfide, Arsenic, Cadmium, Barium Safer Water! Effective against Giardia, E. Coli, algae, fungus, scale and sediment. Long Lasting! Anti Bacterial filter media. Good for 5 to 8 oz glasses daily for 4 to 8 months. Ideal gift for hikers, campers, preppers, survivalists, fisherman, hunters, outdoor enthusiasts. Keep at home for emergency situations. This Propur Water Filter Straw features Propur ECORE Water Purification Technology.