Abstract: A recirculating toilet water system includes: a toilet, a main water tank for storing water and receiving waste matters from the toilet, a filtered water supply means for supplying filtered water as filtered through a screen from the main water tank for flushing the toilet and an air supply means for delivering compressed air for boosting the filtered water for flushing the toilet, wherein the water supply means includes a feed water valve which is normally opened to fludically communicate a flushing water tank with the main water tank to lead water into the flushing water tank and is operatively closed when boosting the water for flushing the toilet by the compressed air, and is further provided with a purging perforation therethrough to eject a partial stream for purging the screen for preventing the clogging of particulate matters on the screen when boosting the water.