The single most common cause of an internal leaking toilet is a degraded, warped, or hardened rubber flapper valve at the bottom of the tank that fails to seal the flush valve opening securely, causing continuous running. The most common cause of an exterior floor leak is a failed or compressed wax ring seal at the base of the toilet caused by loose floor closet bolts allowing the porcelain bowl to rock and break the watertight connection. Verification: Add food coloring to the tank to check for internal leaks, and observe the base during flushing for exterior leaks.
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