They don't fit properly as stated by other reviewers. Thought I'd give them a try as there are so many great reviews. There are more negative reviews about this product than positive ones. Filters don't fit, either they form an air gap or they have to be squeezed so hard that they are drawn through a thin straw like a thick milkshake. If you force the filter to fit tightly in the bottle, it will be very difficult to get it out. The top ripped off one of the filters when he tried to pull it out, causing pain when removing the rest of the filter. The last problem for her was the almost soapy taste of the water when using it. I put her under water and even left her alone for 30 minutes. My wife and I both tasted like soap even after using the one that got wet. We went to the store, bought an OEM filter and found no problems with it. BUY OFFICIALLY and stay away from these filters.
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