Greetings,
sometimes a residue of the liquid remains in the tower (like 0.6 or 2 entities). Can you fix this problem? It interferes with the burning of several liquids because they cannot be mixed.
Aside that, a really good mod. Keep up the work. :D

Sorry for the bad english :)

The flare stacks work like furnaces, they consume a certain amount of fluid and output no product. To minimise their performance impact they don't do any other kind of scripted checks.
As a result there's no way to clear trace fluid remnants automatically. I'm afraid you'll have to use one flare per fluid type.