https://www.aph.gov.au/DocumentStore.ashx?id=df88fdde-8cd6-4537-84d7-683239f1a935&subId=763310
https://wiki.rossmanngroup.com/wiki/Deep_Cycle_Systems
https://wiki.rossmanngroup.com/wiki/Cleanup ... https://www.youtube.com/watch?v=DxfNbxmT3B4