所有腐植酸都有疏松的海绵结构，同时有大量的内部空间。
All HA's showed a loose spongy structure with a large number of internal Spaces.
膜层由内部致密层和外部疏松层组成。
It is composed of inner compact layer and Outer loose layer.
有机离子交换剂的颗粒核心结构疏松，交换反应不但在颗粒表面，而且在颗粒内部同时进行，软化效果好。
Organic ion exchanger particle core structure is loose, exchange reaction not only in the particle surface, and within the particles simultaneously, softening effect is good.
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