Small three-layer turnover box is suitable for filtering 10-50 liters of water. Small three-layer filter box is suitable for small water bodies, such as small fish tanks, fish boxes or aquaculture ponds. Usually, these small filter boxes are suitable for water bodies with a capacity of 10-50 liters. When selecting filtration equipment, the water quality, the required filtration effect and the number of fish or other organisms should also be considered. For a larger water body or a higher biological load, a larger or more effective filtration system is needed to maintain good water quality.