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Dear Urban Drainage, I am part of a second year Engineering design group that is redesigning the toilet to reduce the amount of water consumed per flush. Through our preliminary work we decided that the best option would be to create a two flush system to vary the amount of water depending upon the need. We have also incorporated grey water into the system to eliminate the use of fresh water completely. Currently we are attempting to build a model for an engineering competition to show the inner workings of this new toilet. We would appreciate any suggestions you might have for pipe sizes, minimum water amounts, the pros and cons about grey water and basically anything else that might help out our design. Thanks, Adele Changoor University of Guelph Guelph, Ontario, Canada N1G 2W1 email: [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%