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The normal fishbowl has a defect that is when you change water need to pour the water out, so it easy to make fish out of fishbowl.
This design is using the siphon principle to solve this problem. When you need to change the water, you just need to add a part of the water, so that the water level on the fishbowl over the height of the drainage line, siphon system will start to drain water out of the fishbowl from bottom.
Hubei University of Technology
Yi Miao Wei Gao Bin bin DING Da fei Yu