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every tool is a hammer
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This was caused by flyash overflowing a holding tank and getting into a sanitary manhole. Flyash is the residue of coal being burned. After it's wet, then dries, it becomes like cement. It took years, but the pipe was almost completely obstructed. It took years, but it finally was almost completely plugged. It took jetting and vaccing, the effluent was black, from turning septic in the line because it was so obstructed.
 

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