Ground movement can turn a repeat clog into a pipe-line question
Blue Mound’s clay soil contracts in dry weather and expands again when it gets wet. That movement works against buried drain lines, particularly older lines with joints that can shift apart or lose their alignment. A line may be cleared and flow normally for a time, while a change in its grade or a separated joint remains farther underground.
That is why a recurring main-line stoppage deserves more than the assumption that the same ordinary blockage has returned. Grease, soap residue, hair and roots still cause plenty of clogs, and clearing them restores flow. But when the trouble returns after previous clearing, the condition of the line itself can be part of the decision about what to do next.
Mature landscaping also gives roots a reason to seek out the moisture around a pipe joint or crack. Roots entering a drain line restrict the passage and catch debris moving through it. Clearing removes the immediate restriction; inspection helps establish whether root entry, soil movement or a damaged section is behind the repeated problem.