Indeed, these are all projects of American Pais water purifier. You can enter the words "Pais", "Pais water purifier" and "Pais water purifier is in the United States" in Baidu to inquire about Pais water purifier official website, which has their contact information. These are the engineering cases you mentioned. I have the installation photos of Hongtari J Hotel Pais water purifier here, and I will upload them to you.