The pit must be excavated with corresponding ground dimensions and a concrete foundation board must be prepared (min. 20cm from the border of unit) Settling of the separator consists of its placing on the flat concrete foundation board with an accuracy ± 5 mm (min. 25 cm of thickness), connecting to inlet and outlet pipes, filling the water into the unit 30 cm high and back filling with concrete. Filling with water and filling back with the concrete must be carried out concurrently until top of the tank. On the top of the unit is necessary to concrete foundation board in accordance with the load.