I mean, it is a water filter, but definitely one of the best ones out there! I have had a couple cheap brand ones before, which did the trick for a while, but then you find they run out of filters and make it obsolete. Decided to go for the big money one this time around, and it is so useful that you do not need to worry about the top falling off when you are pouring, or having to remove a top cover to fill it in. What is also great is the huge capacity and quick filter, and I have definitely been keeping more hydrated thanks to these features.