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Gray Water and Gardens | HowStuffWorksTo understand how gray water is absorbed by soil and plants, imagine emptying your backpack on the subway. That pile of stuff is much like gray water. It consists of various items that are useful or useless to the environment you introduced them to. There are certain items that will lie untouched -- perhaps your smelly gym.how stuff works sand washing plants,The largest sand washing plant in the world?Oct 8, 2009 . Video showing a 1200ton per hour sand washing plant installed for the Qatar Primary Materials Company (QPMC) in Doha, Qatar. The plant was designed, manufact.Sludge management sand & aggregate washing plants, CDEA filter press will eliminate waste from your sand and aggregate processing plant and reduce the space required on site. . In order to ensure the sludge delivered to your filter press is optimised for maximum dewatering we may need to look at any existing sand washing plant you have in . How does a filter press work?