Survimate 0.01?m Ultra-Filtration Filtered Water Bottle, Portable, Emergency Product Details 4-Stage Filtration - The Survimate water filter bottle adopts a composite filter technology, can reduce most contaminants. The filter element uses a coarse filter screen, a 0.01?m hollow fiber UF membrane, a sediment PP membrane and an activated carbon fiber to reduce chlorine, bad odor and intercept heavy metals, sediment, soil, organic matter and other impurities, etc. Smaller Filter Pore Size - The filter pore size of the hollow fiber UF membrane is 0.01 microns so that it can filter out 99.99% harmful materials from the water while other brands' filter pore size is only 0.2 microns. The smaller filter pore size, the higher filtering accuracy. Built-in Compass - When you are camping or exploring outdoors, the built-in compass at the top of the water bottle can help you identify the direction. Long Lifespan - The filter element can filter up to 1,500L (396 Gallons) drinking water and can replace 3,000 single-use plastic bottles (500ml). Proper use and maintenance of the water filter can prolong its service life. But for optimum performance, the filter element should be replaced every 3 months. NOTICE: This water bottle cannot be cleaned in a dishwasher. Tips - Fill up the bottle with water, sip the straw 8 to 10 times, then you will get fresh water (It requires more suction than ordinary bottles to suck water out, because the water needs to be filtered through 4 layers). When in use, do not block the silicone hole next to the straw because air pressure is indispensable if you want to suck the water out. But when not in use, it is best to press the adjustable straw back and press it tight, otherwise water will leak out through the silicone hole. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.