You can determine if your toilet has a silent, hidden leak (such as a slow flapper leak) by performing a simple food coloring test. Remove the tank lid and add a few drops of dark food coloring directly into the tank water, then wait 15 minutes without flushing. If colored water begins seeping into the toilet bowl, your flapper valve is leaking internally. Additionally, checking your water meter dial when no household taps are running will reveal if water is continuously flowing. Verification: Watch the bowl for colored streaks within 15 minutes of adding dye to confirm an internal tank leak.
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