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1. When algae first appears: add 2 grains to 10L of water to the filter system. After continuous use for 3-5 days as a cycle, change 1/5 of the water and add it again. A small amount at first and multiple times. 2. When the algae is serious, add 2-3 times appropriately. When the algae is serious, it can be recycled in small batches. After 2 cycles, it can be used 7-11 days apart. For small fish, pay attention to reducing the amount. After 3-5 days of use, the water quality will be obviously clearer and brighter, and the filter system should be cleaned in time.