Jeff, is this one of my skimmers? If so, send me a PM and I can have a look at it. Probably something's changed in the water chemistry to cause this. The only possible issue I can think of with the skimmer itself would be if somehow the big elbow on the inside of the drain fitting fell off. I can't imagine that ever happening, and if it did, it wouldn't increase the microbubbles in the output to the extent you're describing. Are you noticing more foam production than before? If your collection container filled with water or weak skimmate, I'd take that as an indication that something changed in the water to increase the foam production and it could be a lot of things, like medications, underwater epoxy, sometimes even newly mixed up saltwater can cause a temporary increase in foam.