This is a set of 2 standard type cartridge JC0032UG. More economical than a single piece. 300 liters of filtered water for cooking and drinking water. Economical compared to delivery or mineral water. Please flush the water only. In the event of purifying hot water, please boil it once before use. Ingredients (such as odors, etc.) absorbed by the water filter cartridge temporarily may come out in purifying water.