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grease trapa small tank within an outlet pipe that slows the flow of effluent so that oils and fat float to the surface and can be removed (4) |
greenhouse gasesgases such as carbon dioxide and methane that contribute to human-induced climate change (2) |
greywaterwastewater from washing, cooking and clothes washing (1) |
gritvery small pieces of sand, stone and possibly glass and metal found in wastewater (6) |