Read the pattern before buying the clearing. One fixture slow: the trap or branch for that fixture, usually hair, grease, or an object, cleared at the fixture. Several fixtures on one bathroom slow: the branch they share. Everything slow, with gurgling at the toilet when other water runs: the main line, and the house is one load of laundry from a backup at its lowest fixture.
The Littleton reading of a slow drain starts at the lateral. Root intrusion is the bench's named core work here, and whole house slow in an older neighborhood is roots at clay joints until the camera says otherwise. The guide's decision tree ends, in Littleton, with a recording you keep and a smoke test where breaks are suspected, because the lateral's condition is a fact your house will be sold with someday.
What comes back on the cable is the diagnosis. Grease ribbons mean kitchen habits and a line wall that jetting can scour. Roots mean a joint has opened underground and will be visited again on a schedule until the joint is repaired. Scale flakes mean an old cast iron line narrowing from inside, where each clearing buys less time than the last.
The camera is the tiebreaker at $125 to $500 in published guides. It is worth it when clogs repeat, when the line is old clay or cast iron, and before any excavation is quoted. Footage ends arguments: the line either has a defect at a measured distance or it does not.
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