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Water filter clogged at 9,000 ft on the JMT, took 4 hours to fix

Woke up near Muir Pass and the filter was pushing maybe a drip a minute. Turned out algae had packed the prefilter and I didn't carry a spare brush. Anyone else carry a backup cleaning method for those high alpine lakes?
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1 Comment
charliestone
Pre- filter the lake water through a dirty bandana, saves the brush.
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