The cast-iron half of Donelson behaves like cast iron everywhere, with the volume turned up by arithmetic. Published lifespans for the material conflict — the guides in our research put cast iron anywhere from about 50 to 100 years — but a 1960 ranch's original line is 60-odd years old, which puts it inside the failure window under every published range's lower half. The mechanism is inside-out: rust and mineral scale narrow the bore, the roughened wall catches what a smooth pipe would pass, and the line starts clogging on things it swallowed without complaint for decades. Where the camera shows scale rather than a soft clog, the fix is descaling — a chain-flail head and a jetter stripping the pipe back toward bare wall — and where it shows the bottom of the pipe rotted through, the channel-rot verdict, no cleaning conversation survives the footage. That's a repair page's territory, and the footage is what sends you there honestly.
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