Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: what does the water filter do? is it removing impurities while making your coffee? Does it filter out nasty tap water? Thank you!
Document: Good bundle for a nice price - i like that it came with the filter - i don't have to use my own filtered water i can just use the tap.
Single cup packets work so well for those on the run. Packets come in both coffee and tea so even more useful!! You can adjust the cup size to suit your taste. I love coffee but don't like it that strong so I run water through the packet twice for a good sized mug and the strength is perfect. The packets are a little pricey but you can purchase a filter and use your regular roast coffee in this machine. A good purchase all around.
I not only got the coffee maker but also got 2 cups, filter and coffee. I don't drink coffee and this makes it much easier to serve my friends something that they like.
We had a lessor version of Keurig prior to buying this one. This one with the water reservoir makes it so much easier to get that morning coffee going.
Product is great making what you want, how much you want, and always fresh. Item came at the designated date and was immediately put to use.
I like the Keurig brewers and I have used several different Keurig brewing systems but they all have their up and downs. The system is adequate, however, if you do not drink coffee or tea everyday and use the water it needs to be changed. The water seems to go stagnant and become moldy if not used quickly. It really should be changed daily for sanitary reasons.
I bought this or my husband for Father's Day!!!! My mom had one and he commented on how it would save us money on coffee. With our present coffee pot there have been days I made a full pot for him and he drank maybe a cup because he had to leave the house. I believe this is going to save us money and time. My kids were so excited to help me pick it for him. The only drawback I have noticed is refilling the water!!! Lol.
I am so happy with my Keurig. It works really well, heats water quickly, and makes great beverages. I've had it about a month. I wish there was a better way to sample some of the brands of coffee and such before committing to a box of K-cups. I've traditionally been a Starbuck's french roast drinker and like dark coffee generally. If you are like me, I recommend the Target generic french roast--better than Gevalia or Caribou Obsidian--and the Peet's.
Bought this a few months ago. I never knew my family drank so much tea and hot chocolate! My youngest loves making lemonade by placing a cup full of ice under the spigot as the lemondae is made!! This Keurig came with a nice stand for the little flavor cups. It is very quiet and works better than expected. No leaks and the surface does not get overheated.
Love it. Don't have to make a full pot of coffee everyday now. Much easier to take care of and maintain
Answer: Hello, Yes, the filter filters out nasty tap water.  I have not had a bad cup of coffee with this machine.I also think the very best and probably cheaper in the long run is to only use filtered water in the first place.We have a Brita and I refill from that all the time.I do use the charcoal filters also, but, I bought them so I should use them, right.Hope this helped.