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Air conditioners. Furnaces. Humidifiers. Pools. Fridges. Some people's gigantic mouths. Is there anything that doesn't need a filter these days? Discountfilters.com has one for every purpose (except muzzling annoying people, it should be noted), and offers a year-long purchase guarantee in case things don't work according to plan. All major brands are covered, including Samsung, Electrolux, IKEA and so many more, and everything is competitively priced. Sign up for auto-delivery and you can forget about your filter woes forever, because they'll send you a new shipment automatically. And by "filter woes," I of course am referring to your household needs - you're on your own with the creep who can't shut his trap.