I have been using these filters for quite a long time. Recently I noticed that the filter did not screw on tight, water trickled down from the join, and the water from the filter was low quality.I bought/ordered a new flask and some filters and so fine so good. But you have to screw those filters so tight that you feel it might break. You should warn people. But I am glad so far that our water is 000!C xx
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