I purchased a tap filter and 3 additional filters. I found that the filter is just a product sold on AliExpress at almost a quarter of the price for $35 (InFlow charge $129.95 and InFlow are likely getting a cheaper price than $35 by buying in bulk). The representative assured me that their filters are unique and their own. The testing / analysis available on their website does indicate that the filters are independently tested and effective in significantly reducing harmful chemicals.