MEMBRANE PERSONAL WATER FILTER STRAWInnovative Detachable Design: Our WS02 water filter straw now is the only detachable straw on the market, both ends can be disassembled. That means it just needs to replace the filter element anytime and anywhere, no need to replace the straw tube shell frequently, which is truly reusable, money saving, and more environmentally friendly. SGS certificated, Test Report NBF21 004693 01 Superior Backwash Solution: Detachable mouthpiece connects with the