leftovers to helping with certain cleaning tasks. But putting a ball of it in your toilet tank is not a proven shortcut to a cleaner bowl, fewer leaks, rust prevention, or lower water bills.
The trick may look convincing in a short video, but there is no good evidence that it delivers the promised results. At best, the foil sits in the tank without doing anything useful. At worst, it can interfere with the mechanism and create an avoidable maintenance problem.
So, the next time you see someone dropping aluminum
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