Task of the ultra filtration is to make rinsing liquid (UF) from the KTL paint; so the paint saving and recycling can be ensured. A further function of the UF-plant is that the paint tank shall be filtered continuously. The whole delivery volume of the UF-pump will be led through a special filter, which has been installed in front of the UF-modules. The created clean filtrate will be led to an adapter tank, and it will deliver the water seal equipment being needed for the circulation pump too. Within the KTL-equipment a water sealing is required by the pumps, in order to maintain the function of the double-effect slide ring seals having been built there.