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What happens when unusually large debris gets into the system?

A: Debris found to inhibit the performance of gravity drainage systems typically has little detrimental effect on the performance of the vacuum drainage system. In fact, items that would typically block a gravity drainage system will pass directly through the vacuum piping network to the Vac Center collection tanks due to the fact that they are assisted in their movement by atmospheric pressures entering the system in the course of normal operations. Vacuum drainage systems virtually eliminate clogged piping.