Pre-commissioning of closed loop water circuits occurs after installation and before use, to clean pipework, removing debris that can abrade surfaces and encourage biofilm growth.
Biocides and water are often pumped around the circuit with any debris being collected by Depth or Surface cartridges. For ongoing cleanliness, side-stream filtration units are installed whereby a proportion of the water passes through depth or surface cartridges continuously removing contaminants from the whole loop.