I've known its secrets since I received this container a month ago. It really tends to leak, this is a flaw in the design of the lid. I think the cap needs a rubber o-ring or something like that to make a better seal, otherwise air will leak straight through the threads as the bottle shape flexes. The solution I found is to suck instead of compress. When squeezing everything is squeezed out of the bottle and when using it is water. By sucking, you draw water out. Air still seeps through the threads, but the water is sucked in rather than pushed out, so there is no pollution. The rest of the filter works great. Ever since I moved to this city I have had problems with the local tap water, some salt in the water makes my mouth always dry no matter how much I drink, but this filters well enough and I no longer have this problem.
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