In the Kale (Armed Forces and Intellegince Services Campus Complex) project, which is undertaken by REC International Investment-Rönesans Holding, flushing (chemical cleaning) was carried out on all heating and cooling lines by Deser. During the flushing process, the relevant chemical analyses were carried out and the cleaningprocess was monitored by our supervisors. The accredited results and the chemical values of the system water are reported, the welding chips, iron dust, and other pollutants are removed from the lines and than handed-over was carried out untill the water values matched VRF manufacturer standarts.