For example, using foil directly to scrub a suitable metal surface is very different from leaving a ball of foil submerged in toilet tank water. The conditions, materials, and mechanisms involved are not the same.
And when a video shows a toilet flushing normally after the foil is added, that doesn’t demonstrate that the toilet is cleaner, more efficient, or less likely to leak.
To establish those benefits, the method would need to be tested properly.
What Does Aluminum Foil in a Toilet Tank Actually Do?
The short answer? Usually,
