On Java edition you can use a circular water stream align items to be picked up by hoppers. By putting a double chest at the corner the items in the water would be able to clip into the next blocks and get picked up by hoppers.
On MCPE pre 1.2 the items would get hung up on the hit box of the next blocks and stop moving. However, some testing showed that the hoppers would still pick up the items on the edge without using the double chest. So we could still use this for item transportation and filtering.
Now, neither work. Hoppers will not pick up any items on the edge of the water stream and if we try to let them clip into the adjacent blocks with double chests the items get hung up and despawn.
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