BEFORE USING: To remove harmless carbon dust on initial use, draw water halfway up straw, remove straw and discard water, then re-attach straw and drink normally. DIRECTIONS: Expand straw and attach wide end firmly onto filter outlet. Fill bottle or cup from water source, insert filter and drink from straw. Do not submerge drinking straw into contaminated water. Allow filter to air dry for 48 hours before storing. Note: For maximum protection, use the Frontier Filter in conjunction with Aquamira Water Treatment Drops or Aquamira Water Purifier Tablets.