This is a book titled "All About Water and How to Choose a Water Purifier!" Written by Junichi Iwamura and Michihiro Hagure, it provides detailed explanations of scientific information about water and how to choose a water purifier. [Title] All About Water and How to Choose a Water Purifier! [Authors] Junichi Iwamura, Michihiro Hagure [Condition] Shows signs of aging such as yellowing and staining, and some scuffing on the cover, but it is still readable. Please consider this item only if you understand that it is a used book. Please refrain from purchasing if you are concerned about the condition. Thank you for looking.