这东西的作用应该类似离子交换树脂吧。
sigma-aldrich对它的介绍：

Description：
Components       1:1 mixture of strong cation and anion exchange resins
Quality Resin is self-indicating: color changes from blue to amber when exchange capacity is reached.

Properties：
form gel form
particle size 16-40 mesh (wet)
capacity 0.80 meq/g by dry weight