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The bubble trap thing is something. You will see every sump being built around here employ them. Often very poorly with tight 1" spacing and lots of GPH. Not only does it not work, it wastes space and often makes the problem worse by transporting the bubbles closer to the return pump. My sump is big enough and set up so there is no microbubble problem. I like socks to keep my sump clean.
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[This space for rent]
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