Here's an interesting tidbit. I find with a bubble trap (though mine is only two baffles) bubbles still occasionally find their way into the DT. If this happens, I think a simple piece of glass/plexiglass right beside the return pump would fix it.
In ASCII art...
||| |(pump)
Where ||| represents the baffles, | would be the part right before the pump and the (pump) would be the pump (unless you have it external).
In ASCII art...
||| |(pump)
Where ||| represents the baffles, | would be the part right before the pump and the (pump) would be the pump (unless you have it external).