This prototype is designed to work with existing technologies. It is a creative adaptation of ageing technology into a modern device that is more economically and environmentally efficient. It is an evolution of the standard toilet.

Flush...More or Less has been designed primarily to be easy to install - requiring no tools. It is engineered to work with most toilet models. It also very flexible; allowing the user to control the amount of water consumed in a mini-flush. This provides better performance, ensuring that the user gets an adequate flush and the most water is saved as possible.

The Flush...More or Less device consists of two parts. The first is a flapper chain and flapper valve, or floater. The former connects the toilet handle lever at the top of the tank to the floater that lifts and falls, allowing water to exit the tank and enter the toilet bowl at the bottom of the tank. When the toilet is flushed, the time that the floater takes to close varies the amount of water that can drain. The Flush...More or Less flapper chain has been redesigned to include a special cylindrical float positioned at the mid-way point of the chain. The add-on float uses it's buoyancy to keep the flapper elavated, but when the water level drops below the float, it is no longer buoyant and thus can no longer hold up the floater. Therefore, the flapper closes when only half the water has drained. This amount can easily be adjusted by moving the float further up the chain to use less water or further down to use more.

The second component is the key to the dual flush. It is a handle that includes a selection slider to choose between the two flushes, mini or full. Before flushing the toilet, users simply select the wanted flush.

By sliding the selector away from the handle pivot, the weight on the handle provides a downward force, which raises the lever for a longer period of time. The buoyancy force of the float is thus counteracted exactly, and the flapper does not fall early. This creates a full flush - all the water drains out of the tank. By sliding the selector towards the handle pivot, no force is applied and therefore a mini flush is created. This design was created using knowledge of physics concepts such as levers and mechanical advantage. Values for the amount of force required were calculated using models for buoyancy force.