In- Specification Application:Lake, river, stream Accuracy:0.1 micron Output:750ml/min Dimension: 4*13cm Net Weight:49g Capacity:4000L Please filter visually clean water with this filter straw to extend life span. Flush water straw after using to keep clean and prevent from clogging. *Not for children under 6 years old. Choking hazard. *Not for salt water and sea water. *Not wash with detergent, disinfectant etc to avoid damage. How to Use Method 1: Drink directly from the raw water. Connect the valve, filter and silicone hose together, The arrow direction of the filter is shown in the figure, put sediment filter head are put into river water. Method 2: Filter by squeezing plastic bottle. Pour raw water into a plastic bottle. Screw the filter directly onto the plastic bottle. Please connect the end with silicone gasket. Method 3: Filter by gravity. Connect water bag, hose, filter and valve. Pour the raw water into water bag. Open and close the water flow with the valve.(Water bag need to be purchased separately) How to Clean Flush Fill the syringe with clean water. Align the syringe with the water outlet for backwashing How to Store Step 1: Recommended for one person use; Step 2: To use again, water filter can be back-flushed with ease by syringe, Please use clean water only while back-flushing; Step 3: Before storing the water filter, back-flush with clean water and then soak in a mild vinegar solution or mouthwash to disinfect the filter; Step 4: Cover both ends of the filter element with hoses, sealed; Step 5: Store in a dry, low temperature condition, sunlight, sheltered.