This invention relates to structural changing of the waste water drain trap in housing construction and the double valve water tank of the waste water filter and sanitary ware urinal.

本发明涉及改变住宅建设排水管结构及废水过滤器和卫生洁具便池双阀水箱，改变各楼层废水排水管结构利用二次水自流过滤流入便池水箱冲洗便池及冲洗拖布。

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She felt around in the blocked sink with her rubber gloves, poking into the plughole with the toothbrush, pulling at the ends of the fibres caught in the trap, tugging and coaxing until she began to deliver up out of the drain a nasty mass, a thick rope of hair and soap and matted insulation, in a gulp of bad drain smell.

NEWYORKER: Friendly Fire