Charcoal had better be kept in the refrigerator for a long time. Put it near the inner layer, pick bits and pieces, wash them quickly, and dry them with gauze bags, and the odor in the refrigerator will disappear. It is also suggested that everything in the refrigerator should be taken out, scrubbed and put back. Take out the charcoal and dry it for a while before putting it in. It can be reused and has no expiration date. Grapefruit and lemon will leave bacteria. Oh, not ideal.