Houston-area clay expands when wet and shrinks when dry, and buried drain lines ride that motion. Over 20-30 years the results are bellies (low spots that hold water and solids), offset joints (steps in the line that catch everything), and cracked fittings - the three findings on nearly every suburb camera inspection.
The symptom pattern is a drain that clogs on a worsening schedule: yearly, then seasonally, then quarterly. Each cleaning is real, and each buys less time, because the geometry causing the clog is still down there.
The repair conversation that follows footage is about sections, not systems: most lines fail in one stretch. A quote to replace an entire line without footage showing the whole line is bad is a quote to be suspicious of.
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