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In post-classical Kilwa, plumbing was prevalent in the stone homes of the natives. [50] [51] The Husani Kubwa Palace, as well as other buildings for the ruling elite and wealthy, included the luxury of indoor plumbing. [51] In the Ashanti Empire, toilets were housed in two story buildings that were flushed with gallons of boiling water.
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
Restaurant and food service kitchens produce waste grease which is present in the drain lines from various sinks, dishwashers and cooking equipment such as combi ovens and commercial woks. Rotisserie ovens have also become big sources of waste grease. [4] If not removed, the grease can clump and cause blockage and back-up in the sewer.
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Designated as an American National Standard, the Uniform Plumbing Code (UPC) is a model code developed by the International Association of Plumbing and Mechanical Officials to govern the installation and inspection of plumbing systems as a means of promoting the public's health, safety and welfare.
A more user-friendly indoor water use [clarification needed] The Dublin Statement on Water and Sustainable Development is a good example of the new trend to overcome water supply problems. This statement, suggested by advanced economies, has come up with some principles that are of great significance to urban water supply. These are:
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