| http://www.w3.org/ns/prov#value | - In addition, the primary particle diameter of the raw material zeolite is preferably 2 ??m or less, more preferably 1.5 ??m or less, especially preferably 1 ??m or less, as determined by the determination method described in Item (1-1) of Examples set forth below, from the viewpoint of improving the cationic exchange speed of the zeolite of the present invention obtained in the after-treatment.
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