A method and a system are disclosed for detecting the features of a water layer in layered enclosures of single unit dose products. Thanks to the method and the system of the invention, the layered enclosures may be manufactured to higher specifications and quality owing to real time control of the features of the water layer between the enclosure layers. The technical advantage of the method of the invention consists in the possibility to detect the features after formation of the layered enclosure is complete—hence inspecting the finished product—and to feed back the detected information to the very water laying device for a real time adjustment of the features of the water layer at the areas where acceptance criteria are not met.