Keep getting Silicon readings in my ICP tests for RODI water. Using a 4 Stage KleanWater Advanced RODI system with Booster Pump. Always use Color Changing DI Resign and change it out when 1/3 has changed color. TDS always reads 0. Does anyone have any ideas as to what is causing the silicates to get through or what I can add to the unit to remove the silicates?