Opus thoroughly recommends cleansing a system as an important part of the installation process. The recommendations within BS7593 should be followed, whilst also paying attention to the appliance's installation and servicing instructions and any guidelines specified by the flushing agent manufacturer. It is best practice to cleanse an existing system before installation of the new appliance. After installation, the system should be cleansed of debris and refilled with inhibitor. Our team is fully conversant with all current standards/regulations relating to this aspect of the installation.