You won't find these filters in any major store, so don't worry. They're expensive and it's annoying that you technically have to replace them four times a year, but bite the bullet and do it when you see savings on your energy bill because your heating/cooling unit doesn't have to work as hard . . I don't check the air quality in my home regularly, so I can't tell you I'm breathing fewer toxins than I have in the last month, but at least I feel like it.
Filter under the sink Aquaphor Favorit ECO silver
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