As others have said, it is lack of venting, but it can be due to different causes. While any drains within 4 feet of the toilet will vent easily through the main stack vent, kitchen vents will often be further away and need a separate vent stack up through the roof. In order to allow for more flexibility of fixture placement "back vents" are often used. These will extend upward in the wall to a height above the fixture drain and then horizontally to a main "through-the-roof" vent stack. Vents have no water flowing through them so they are not subject to plugging except by rare situations like frost build-up or birds or wasps etc. Sometimes where a back vent is needed it is not installed. retrofitting can be difficult but there is an option in the form of a "closet vent" or "vent check" which is installed under the sink by teeing off from the drain pipe. It has a light spring which keeps t closed until there is water trying to go down the drain.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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