Execution design for the Nida River exposition. Contrary to the one made earlier, the filtration was designed on three separating circuits. Compared to a single circuit, this gives enormously greater safety and enables easier servicing. Some devices have been omitted, some have been duplicated. Instead of the submain, which is difficult to perform, with the use of a retention reservoir, a permanent water change system was established.

UV sterilization omitted from the original design is included.