is a oil-water divider laboratory now.
After half of the day, once the fluid divides in the tank, I drill a hole on the bottom to realize the water to another tank. I have a bolt now in the hole, so I may use same tank for more times. After water runs out and the oil gets close to hole I clog the hole with bolt.
Oil floats on the water.
Remember: ” Never let oil or diesel in the ocean!”