The CASA-FR is specifically developed for the bleaching and scouring of flax roving winded on spools. A carrier having a number of perforated spindles holds the spools. The spool winded with raw flax roving is stacked on to the spindle and secured by a fastener. The carrier is loaded into the machine. Process liquid circulates through the flax roving; bring chemicals to the material to complete the bleaching and scouring process. Chlorine dioxide flushing device flushes away the remaining bleaching gas. The flow rate is selected at its optimum saving power consumption.