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A comment on Firefighting foam leaves toxic legacy in Californians’ drinking water. Parent comment

Re:Firefighting foam leaves toxic legacy in Californians’ dr... by rsync on Tuesday October 08, 2019 @03:29PM (#21196168)
"In my case, however, a pair of 48"x10" granular activated carbon filters ..."

Are those backwashing filters with a head unit that contains a pump ? What level (micron) of filtration does just that unit achieve ?

Just curious ...

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Re:Firefighting foam leaves toxic legacy in Californians’ dr... by LeifCarrotson on Tuesday October 08, 2019 @11:24PM (#21199720)
No pump, just passthrough. I don't believe they provide any filtration, just reaction mass/catalyst. I can take a picture tomorrow if you're curious.
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