What Happens if There is Too Little Water Going Down the Bathroom Sink?
A. When the toilet is flushed, a 12 volt submersible pump inside the vanity tank is turned on. Any reused water in the vanity tank is pumped to the toilet to be used for flushing. When the vanity tank is empty, the normal flesh water valve is opened and the toilet fill cycle is completed with fresh water. The system always uses the vanity tanks reused water first then supplements it with fresh water.