Iron removal filter RO system water purifier machine . At initial status, both of the the and ‚ are full, and tƒ is empty, after sometime for using of fluxing solution and it needs treatment, open “pump 2”, at this time the fluxing solution in ƒis pumped into , when it is full, the fluxing solution overflow into ‚through overflow pipe, when the ‚is full, “pump 2 “can be closed