Hello, the water purifier you mentioned is used for hemodialysis? If so, it is a Class III medical device, which is one of the most strictly regulated classes of medical devices in China. Both production and sales need to be strictly regulated.
If it is only a general life with the water purifier does not belong to the scope of management of medical devices, only need to meet the provisions of the industry and commerce, can be produced and sold.
The following picture is about the dialysis class classification catalog, I hope it will help you.