| 摘要 |
PROBLEM TO BE SOLVED: To provide an additive set by which additives stored in each container are emptied almost at the same time. SOLUTION: This additive set is a pair of additive sets for changing water of a water tank for ornamental fishes, etc., in which two or more kinds of additives added to the water of water tank for the ornamental fishes, etc., are stored in each container and is characterized in that the each additive stored in the each container is controlled in concentration so as to be used in the each same amount to a certain amount of water.
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