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The predicted 50% Cs breakthrough determined from batch contact results agreed within 10% of the column results. The capacity determined from batch contact testing agreed with column testing within 7%. It is not possible to equate the batch contact results to understanding the number of BVs that can be processed before reaching the contract limit for Cs from the lag column, as this depends on the slope of the load curve/mass transfer zone. v Acronyms and Abbreviations ASO Analytical Support Operations ASR Analytical Service Request BV bed volume CST crystalline silicotitanate DI deionized DSSF double-shell slurry feed FMI Fluid Metering, Inc.

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Feed Equilibrium Kd (mL/g) Calculated 50% Cs Breakthrough (BV) Equilibrium Cs Load Capacity (mg/g) 5.6 M Na Simple Simulant 545 136 31.2 AP-105DF 887 222 7.5