My sister's toilet with a built in hand basin - it uses the waste water to fill the cistern for the next flush : r/mildlyinteresting
Bailey 550mm Full Pedestal Basin and Back to Wall Toilet Suite with High In Wall Concealed Cistern and Satin Chrome Flush Plate - Wholesale Domestic
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This hand basin is a part of the toilet. When you flush the tap runs long enough to wash your hands and fill the cistern. : r/mildlyinteresting
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GrandeSys (AquaDue) Toilet cistern with integrated sink SPARES
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Would you use a sink that is attached to the tank of the toilet to save water? - Quora
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Two In One Combination Close Coupled Toilet with Wash Basin
