This filter cartridge is 1/4" shorter than described (description). Dimensions of this cartridge), but it is only 9 1/2". long. It's not airtight because it's too short. You may not notice this problem if your filter housing isn't transparent. I've seen the filter pop up and leave 1/2". Gap at bottom 4 cm. I found that strange because it's a Campbell system and it's supposed to be a Campbell cartridge.
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