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  • Theory OK?

    This, clipped from another site:

    4 in. soil pipe offers a more efficient way to dispose of solid material, but the introduction of low-volume toilets and other water-conserving measures, significantly reduces the level (height) of water in the pipe, resulting in significant clogging within the soil pipe. In new construction, the 4-in. pipe is now too wide for long, horizontal runs (especially between the home's main vertical drain, or stack, and the street).


    3-in. soil pipes raise the flow level in horizontal runs and, as a result, suffer fewer clogs.
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