Filling the pit 1/3 to fix the pump chamber

During filling, follow these points:

• Make sure to check the pump chamber continuously for a plumb-vertical and constant position, and for deformation or other indications of installation errors.
• Make sure to fill manually and compact (shovel, hand rammer) the areas next to the pump chamber wall, the cover flange of the pump chamber and the pump chamber extension.
• Make sure to hold in position the pump chamber and the pump chamber extension installed from rising up. If necessary, fill the pump chamber with water before filling and compacting.