How does trash separation work in Korea?

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Three streams. General waste goes in the official pay-as-you-throw bag (종량제 봉투) for your district, sold at convenience stores and marts. Food waste goes in a separate food-waste bag or the building's RFID bin. Recyclables (paper, plastic, cans, glass) go out sorted on your building's collection day. Days and bag colors differ by district — check your gu/si office website or ask the building manager.