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Possibly the most used yet most taken for granted household fixture, the toilet is a marvel of engineering simplicity. Even typical modern toilets still employ just a couple basic mechanical components. The rest of the flush relies on the natural forces of gravity and siphoning action.

But sooner or later, every toilet develops problems like weak flushing, clogs or constant running. When that happens, most homeowners just live with the problem or pay a plumber a lot for a simple fix. You don’t have to. If you know how a toilet works, you can diagnose and solve problems yourself, often in just a few minutes. So let’s lift the lid to see the magic that happens in the bowels of this underappreciated fixture.

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