To capture the sample from one liter of "clean" water, a tiny quantity of carbon was needed, mounted in a perfectly clean and narrow tolerated glass holder (no plastic nor glue allowed!). Together with my father I developed the method to mount those filters by hand. Then, I mounted a specific production facility with my collaborators and successors Rosmarie Quarteiro and Daniel Gränicher, that continue manufacturing the product for drinking water survey and many other research and control purposes.

Filter holder, sample tube and filters of 0.5 and 1.5mg of active carbon

Two tables in a small room are dedicated to this product.
On the left, the filters are mounted and melted, on the right, they are cut, polished, tested and packed.