I used to buy a filter, but, I don't even like using the filter on this faucet, I don't know, I might go back to it, I'm getting sick of lugging the bottles home, but, I do like the convenience of the bottles. I like to partly freeze them for my travels when I have to take the bus, this way they defrost gradually in this hot florida sun and they are a good size. I do have travel bottles, but, the size of them don't alway fit in my purse as conveniently. Guess, I'll have to work around this. The filter is less expensive. I don't know, I really just don't like my water in this area.