Problems: Clean water is a huge problem in some regions of the world. Yet in some countries, people use clean water to flush the toilet. Why do we use clean water to flush human excrement ? it is a waste of clean water.
I cringe whenever I flush the toilet and imagine in some part of the world people will kill for the clean water that I wasted every single day. Why can't we flush with USED WATER instead?
So here is the idea, the used water from hand wash basin and bathtub can be used to flush the toilet.
The integrated bathroom system consist of a wash basin and bathtub connected with pipe to the toilet flushing system.
After we wash our hands, brush our teeth or take a shower, the water is kept in storage and later used to flush the toilet.