Another option, and what BRS did, was take a piece of Lifeguard Aquatics Aquamesh filter pad, because it's stiff and holds its shape, and use it as a baffle after the drain hits the water. I would use the fine version though if you want to trap all bubbles, but it may clog faster. Just have it go from top to bottom all the way across and the water will flow through it.
From what I've read of their reviews, even the fine is pretty coarse and not good at trapping debris. You could try the coarse but some bubbles may get through. It's not a good mechanical filter pad, which is what you're looking for.
I'll link you to the page...
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