It must pass first through an oil interceptor, then a silt trap before going into a foul sewer drain.

She had practical needs too: a leaky roof, plugged-up sewer drains, a rattletrap car.

In addition, many of the city's storm sewers drain into the river.

There, the rainfall backed up sewer drains, flooding homes and cars.

Disadvantages of air burst drain cleaners include a limited cleaning range in pipes that do not contain standing water and, in general, ineffectiveness for unclogging blocked main sewer drains.