PROCESS FOR MAKING VISIBLE THE SEPARATION LIGN BETWEEN CATIONIC AND ANIONIC EXCHANGERS IN MIXED-BED FILTERS

摘要

Method for rendering visible the line of separation between cation exchangers and anion exchangers in mixed-bed filters, in which method an amount of a cation exchanger (anion exchanger) sufficient to form a visible line is added to the cation exchangers and anion exchangers constituting the mixed-bed, the added ion exchanger clearly differing optically from the cation exchanger and anion exchanger used to build up the mixed-bed and having a density 0.01-0.05 g/ml lower (higher) than that of the mixed-bed cation exchanger (mixed-bed anion exchanger), and the resin beads of which predominantly having the same particle sizes as the finest (coarsest) screen fraction of the mixed-bed cation exchanger (mixed-bed anion exchanger).