Today I received my OKO H20 Level-2 Advanced Filtration water bottle. After rinsing the bottle and filter several times, I filled them with tap water and drank the almost perfect tasting water. There was almost no aftertaste from the filter. I'm comparing this to another brand's filtration system I tried last week. The latter continues to deliver a bitter taste and I have stopped using it. I agree with other reviewers that the carabiner that comes with the OKO is flimsy so it sticks to it. It will not survive serious outdoor activities. The mouthpiece also needs to be redesigned to have a dense coating to protect against dust. I haven't found a leak, but my bottle is new. I'm happy with OKO and would recommend it if you're picky about drinking water like me.
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