Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Describe water filter?
Document: My old Keurig died one morning mid-cup, and anxious doesn't begin to describe my mental state as I waited for this one to arrive. My old one didn't have the water filter, so I was a little concerned about it. The first few cups tasted... metallic? Something was off, and I blamed it on the water filter. However - thankfully - after about 6 or 7 cups, the taste disappeared. Phew! After that, it's been smooth sailing.
I have no complaints at all. It is more than I expected and I like having the water filter. I'm using it a lot more than I thought I would.
My second Keurig. Very nice model -with the new water filter feature- will hopefully make it last longer (the first one lasted 4 years).
This is the best part of waking up! I love that it also filters the water. The K cups are expensive. I did purchase the K cup filter to help with the cost.
We bought this because our Cuisinart had died. I like it, but wish it had a larger water tank. We also purchased the filter stuff to brew our own coffee as the K-cups are extremely expensive.
Second Kuerig for us after converting from Bunn 3 years ago. We are coffee drinkers and fairly heavy use. This is only slightly different in appearance from our K60. Does run faster and has water filter.
The keurig is great! came with plenty of different flavors to try which was a pleasant surprise. The water filter kit was included and worked splendidly. It's simple to use and makes quick great tasting coffee!
I love that you can slightly adjust the brew temperature, and the screen is nice for the features. BONUS: It comes with a water filter to filter the nasty tap water from our old building. I would recommend.
I was able to get her a gift just because I wanted to and this one will bring her so much enjoyment and coffee! !Keurig K65 Special Edition Gourmet Single-Cup Home-Brewing System with Water Filter Kit
This unit was purchased for my mother. I already have one myself. They've added the water filter to this one which my mom had no trouble setting up. Supposed to limit the need for de-scaling though my experience shows you should still do this periodically as indicated.
Answer: It's a small mesh covered charcoal  filter that fits very easily at the bottom of the water reservoir. You're supposed to change it every 2-3 mos. We haven't done done so yet because it's brand new.