Drain and waste pipes must flow downhill from all sources of draining water, such as sinks, toilets and showers. If a pipe flows uphill, water will drain slowly or may not completely drain the basin. When the water level in the pipe is equal to the water level in the sink, the drain will stop flowing. This is corrected by installing plumbing pipes in the correct downward slope of at least 1/4 inch every four feet, away from the source of draining water.
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