Depending on the planning, the system can be filled with heat transfer fluid (usually a mixture of water and ethylene glycol with a glycol content of 25 to 30%) and then flushed and ventilated. A simple solar flushing pump can be used for systems in which each individual GeoCollect strand is welded to the distribution system; in the case of strands connected according to Tichelmann, a more powerful flushing pump must be used.
The GeoCollect system has to be slurried until the collectors are completely covered. This creates an “adhesive” connection between the ground and the modules. Air trapped in the collectors is not permitted. Systems covered in sand and then slurried are laid out in a strongly consolidated mass. This allows the upper part of the excavation pit to be consolidated with ease.