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Margaret,
The filter has pumped less than 6 liters of clean, Big Sur water so in that respect you should not need to change it. However, said use was back in 1999. I'm not sure if filters lose their potency with time.
Regarding the wide mouth Nalgene bladder, I agree its an odd duck. Given the extra cost and effort required to fill and clean bladders I'm a soda pop bottle convert.
Enjoy
Casey
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