A study of the characteristics of a super water-saving toilet with flexible trapway by measuring accumulated flow rate

The issue of water shortages is aggravated with increased pollution and global warming. Given that water usage from toilets constitutes the majority of domestic water usage, water-savings realized through toilet use is one of the most effective ways to resolve water shortages. Therefore, a comparative analysis of the flushing and water-saving performances of a flexible-trapway toilet was conducted in this research. In addition, the flushing performance of the toilet was quantized through the development of a measurement method to measure the accumulated flow rate and mass flow rate of the trapway with respect to time. As a result, the flexible-trapway toilet yielded stable flushing and good filth emission performance with an inflow of 4 kg. However, the fixed-trapway toilet failed to generate a steady siphon with an inflow of 5 kg. An ultra-water-savings toilet that combines a flexible trapway and pressure assistance will be developed in the future.