File:Axolotl farm hopper.png

Summary
Underwater view of hopper and chest with water flowing toward it in an axolotl farm, Bedrock Edition 1.17.30. The button on the wall creates an air space above the hopper, preventing the source water block from flowing in. The hopper should be 1 block below the flowing water layer or there is a risk of items getting trapped under the hopper. Items should fall into the hopper from above.