You can buy this system on Ebay the item number is - 221298185271 At the moment I only have 1 of these systems. It was built and finished just before I posted video. Many thanks
It's pretty simple actually. Say 5% of waste oil is water(It's less but let's say 5%) it will settle to the bottom. The tap is up from the bottom so the water would not leave, just the oil. After draining all oil you could tip on side drain water. Of course you would drain into a temporary bucket or container to make sure it's all water and not oil, leave for an hour skim oil on top throw water out? I guess anyway xD