The same dumping phenomenon seen in the previous “desilicizer” experiment, can also occur in demineralizers, but is less likely because the anion exchanger is seldom operated until every hydroxide exchange site is exhausted. Although silica dumping can and does occur, a substantial
concentration of silica is frequently found on exhausted anion resins even when no hydroxide form capacity is left. This is probably because the low pH after the cation exchanger restricts the ability of silica to leave the anion resin and re-enter the water stream.