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Updated: April 30, 2025
Where no form of grease-trap is used, there is a certain argument in favor of the use of six-inch pipes for the upper part of house-drains. The use of a grease-trap, however, should always be insisted upon; and with its aid these obstructing matters will be retained, and the outflow may be perfectly carried by a four-inch pipe.
Carry the lower end of the main drain at least five feet beyond the cellar walls of the building, of cast iron. Let us now look at the outside work. Carry this pipe on the outside of the house as high as the top of the chimney. A grease-trap should be provided for the kitchen and pantry sinks. I have made one or two patterns for cast-iron ones, but none as yet that I feel satisfied with.
The grease-trap referred to above may be any form of reservoir which will retain the flow from the kitchen sink until it has time to cool, when its grease will be solidified, and will float at the surface. The outlet from this trap should be at such a distance below the surface of the water, that there will be no danger of its floating matter passing in with the discharge.
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