12-31-2008, 04:45 PM
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What is happening here is that air going into your overflow standpipe is collecting in the plumbing. As the air congregates in the pipe, the water is slowed until the bubble is large enough that enough water cannot pass by it, and it is forced out. If you look at the water level in your overflow, you will also see the level in there fluxuating. There are a couple of possible solutions to this problem. If you are lucky, simply repositioning the plumbing a bit will solve the problem. You can also look at your overflow standpipe. A durso standpipe may or may not solve the problem, but they are simple enough to make, so if you dont have one in place, give it a try. Finally, you may need to slow your waterflow, but only if you cannot solve it with the other fixes.