According to the discussion forum on Seachem's website, they are no longer recommending using the pH regulator or buffer solution when recharging Purigen.
Here is a
Link to the discussion.
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Dee
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Eheim Pimpette #270
Eheim Pro II 2028; Classics Series -2215, 2217, 2260, 2262; Pro 2229 Wet/Dry