Generally speaking, the Aussies and Israelis have some of the top of the line Reverse Osmosis Purification Tech. I saw a ROPU (reverse osmosis purification unit

Generally speaking, the Aussies and Israelis have some of the top of the line Reverse Osmosis Purification Tech. I saw a ROPU (reverse osmosis purification unit) truck from the Army Corps of engineers when I was active duty US Army and that thing was unreal. You could ingest raw sewage into that thing and out would come drinkable, albeit not wonderful tasting, clean drinking water.