Forget how a regular toilet works? Click here for a refresher course...

Which solution did we finally choose? Continue on to the Prototype...

What are some solutions other people have thought up? See our Bibliography for related links.

Though the Flush... More or Less is a highly efficient, water- and cost-saving device, the Witloo team considered several other modifications (which require changes in the tank structure and/or tank components):

• Using two flapper valves and two corresponding handles to control the two flushes; each would have a different delay time in covering the hole, resulting in a whole or half flush.
• Shorten the chain connected to the flapper valve, so that the air bubble is released sooner, creating a shorter flush.
• Creating a gear/pulley system within the toilet tank, so that the handle can be made to release at different speeds.
• Place in the toilet tank a box with flaps that can be opened and closed by the handle as required.
• Using two "nested" flapper valves in a half-flush by opening the upper valve to release the main valve's air bubble early.
• Counterweighing the system by attaching a movable weight to the lever inside the tank.

After many vigorous hours of crowding around the washroom stall, the group reached an understanding of how the toilet's internal mechanisms work. Time was spent brainstorming and creating prototypes that would make the dual-flush idea possible.