PROBLEM TO BE SOLVED: To provide an RO water purifier for obtaining pure clean water at a low cost and with high efficiency while automatically monitoring a TDS concentration inside a raw water tank, in a purification system for returning concentrated water discharged from an RO membrane to the raw water tank and purifying the water.;SOLUTION: Accompanying the progress of water purification by an RO membrane apparatus 9 and active carbon tubs 7, 8, 10, clean water is transferred successively to a clean water tank 26 through a clean water supply pipe 24. For the clean water flowing to the clean water supply pipe 24, the TDS concentration is measured by a clean water sensor 25, and the measured value Ct is read. Then, the TDS concentration Ct of the clean water and a reference concentration C0 are compared. When the TDS concentration Ct of the clean water is higher than the reference concentration C0 by the comparison, the drive of a water pump 4 is stopped by a driving signals 4 and alarm processing of urging the exchange of raw water 2 and the RO membrane apparatus 9 is executed.;COPYRIGHT: (C)2010,JPO&INPIT
展开▼
