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

Input:
Question: Are these paper filters treated with chemicals? I want to find toxic free coffee filters, hopefully, this is the one!
Document: I hate the taste of the paper filter in my coffee. I also don't like bleached filters because I don't want any non-coffee chemicals in my daily cup! I have tried a lot of different varieties, including the Melitta unbleached and Peet's oxygen-free. The Melitta is not great, Peet's is pretty good, but these are the best so far - as near as I can tell they impart none of their own flavor to the coffee, allowing the subtleties of a really nice bean to come through.
Hario Paper Filters for 02 Dripper are the only kind I will ever use. I have made great coffee for decades, and I find the Hario system makes a good strong, but not bitter, cup of coffee. The filters are made perfectly and don't burst like others do. For one or two people, this is the only way I would recommend enjoying a great cup. The filters arrive quickly, well-packed, and in excellent new condition.
I always wet the paper filter before I put in the ground coffee. One day, I happened to smell the water before I dumped it out. The smell of the water after wetting this Hario filter was so bad and I simply could not continue to use this Hario filters. I do not know that kind of chemical had contaminated these Hario filters. (Maybe this only happened on the package that I purchased.)
I use these to make one cup at a time of delicious pour-over coffee. I've used the bleached paper version in the past. Honestly, I doubt I could taste a difference if given an otherwise identical cup of coffee made with each version -- but the natural version seems like it's probably the better environmental choice.The package was delivered ahead of schedule, and the price compares favorably to the same brand filters I get at my local coffee shop. Very happy with this purchase!
I purchased the Hario one cup glass dripper while on vacation in Portland, Oregon. Needed to buy more coffee filters to go with it. Never knew of this kind of one cup maker originally from Japan. I enjoy a good cup of coffee in the morning and making one cup this way gives me a fantastic taste perfectly made. They Hario filters are quality natural paper and never tear. Made only for the Hario dripper. I always default to amazon.com for finding things I don't know where to look.
Excellent paper filters all around.The "seam" is small and easily folds to one side to maintain roundness of the filter when placed in the Hario V60 dripper. The filter itself is also big enough that about 1/8" - 1/4" is visible above the edge of the Hario V60 size 02 dripper.I would purchase these again and recommend them to anyone with a Hario V60.
After trying other brands easy to find and cheeper  I decided that's worth paying for this filters.Making a delightful  cup of coffee is like a ritual for me and I always  pay attention to every detail, is not only a matter  of having great coffee beans. I have different ways of brewing  coffee, but for a regular  cup of coffee I prefer the Hario dripper.
I was out of town camping and forgot my usual Melitta cone filter device that takes No. 2 filters. The closest store I could find a single cup filter was at Williams-Sonoma and they only carried the Hario. I've been extremely happy with this cone filter device. It's faster (so watch out, your coffee will fill up your cup very fast!) and I swear to my spouse the coffee somehow seems to taste better.
Anyway, I'd recommend this coffee filtration device to anyone, but keep in mind the filters will have to be ordered online unless you're near a Williams-Sonoma and find that more convenient. I just love using single cup filtration devices as there's no coffee machine to mess with! I just fill up a 16 oz. Bodum or similar travel mug and have all the fresh tasty coffee I need to get my morning going.
Today I'm placing a order I don't want to run out of them.
Answer: They're not treated with chemicals the papers are whitened using an oxidizing agent that not toxic or harmful. That's why it doesn't leave a taste behind.