In case you need emergency drain repair ask Plumber Toronto

Pulled by the force of gravity, used water leaves the home
through extra-large pipes, while at each fixture a trap shuts the door on the
departing waste.

Under every lavatory, sink and bathtub, a bend in the
drainage pipe – called a P trap because of its shape – stands guard against
pollution. Water always remains in the bend of the trap, preventing gases from
rising out of the drainage system and into the home. Many traps have a bottom
plug for cleaning out obstructions – or for retrieving a ring that drops down
the drain.

Under some conditions, however, a drop in water pressure
allows wastes to intrude into the supply system – a menace called
back-siphonage. It happens if a turned-on spray shower is left submerged in a
bathtub. As long as pressure is maintained in the supply line, the waste water
cannot enter. But if there is a break in the supply main, the sudden drop in
pressure may siphon the polluted water into the fresh-water side of the
plumbing system.

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