Pipes and Their Use

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grey water = the relatively clean waste water from baths, sinks, washing machines, and other kitchen appliances residential application = so you can use it at home copper = a red-brown metal, the chemical element of atomic number 29 (Cu) PVC = polyvinyl chloride [ˈklɔːrʌɪd]= a synthetic thermoplastic material made by polymerizing vinyl chloride PEX = cross-linked polyethylene = a type of plastic piping known for its flexibility, durability, and resistance to heat and chemicals galvanized = (of iron or steel) coated with a protective layer of zinc brass = a yellow alloy(=metal mix) of copper and zinc cast iron = a type of hard iron that will not bend easily and is made into shapes by being poured into a mould(=a form) when melted
EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.