Review on OptiCharco Filters: The Ultimate Keurig Replacement by Andrew Kamkoff

I bought these for my Keurig coffee maker. When I received them, I first soaked them in water like Keurig filters normally do. To my surprise, I saw the oozing coal turning the water black. I tried soaking the same filter in water, the water turned black again. Then I tried the second filter, I thought maybe the first one was bad. The water turned black again. I do not recommend buying these filters. I used the third filter to take the attached photos. The image of a cup with a filter colored the water black. The water was crystal clear until the filter was added. You could see the charcoal spurting out. The third shot was taken when the filter was removed.