It’s still a nice amount of water They move thru the system. I see a high pressure pump in the system so I would guess they are using a modified version of a dissolved air flotation (DAF) system. DAFS just love to separate oil from water and on their own do a great job. They speak of bacteria so I would assume the ozone is used to kill it off. I wonder if they save the oil left over from process and use it. At the least I give these guys credit for building a rig and getting it into the field. DDABET