The BRITA Maxtra Pro comes with a water quality monitor and includes 3 filters. This is an authentic product purchased from the official Amazon store. The filters are also genuine, so you can rest assured that they are not fake. - Model: BRITA Aluna XL Maxtra Pro - Number of filters: 3 There may be some dirt or minor signs of use, but I used it carefully, so it's still in good working condition. I will clean it before shipping, but please wash it before use (>. <) Thank you for looking.