This question has been asked before but only with respect to washing a small container.
We have a friend who runs fruit stands in the summer and we typically get 10 pounds of blueberries at a time from him. Before freezing or eating, they need to be washed, and I always struggle to find an efficient way to get rid of the squished berries, the stems, the leaves, etc.
I'll post what I do as an answer, but I wonder if there is a better way, or some equipment that would make it easier.
Best Answer
When I was a kid, we picked tons of blueberries. We had a frame made out of 1" x 4" boards, 2'+ wide and about 4' to 5' long. At the far end, the frame was angled towards the middle (narrow side) with a space for the berries to drop into a bucket placed below (maybe 4" to 6"). On the bottom of the frame we had metal window screen stapled down (no cloth screen back then, not sure if cloth would work). Place a bucket at the one end (narrow tapered end), dump berries at the opposite end, raise the frame on the far end (away from the bucket) enough so that when you gently shake the frame, the berries start rolling towards the bucket. The screen will help hold the smaller leaves in place. Some you will have to raise the frame higher for, some you will have to remove leaves directly attached to the berries. Once the berries are in the bucket, dump the leaves left on the screen and start with the next batch. Always worked well and was very fast. Best with fresh picked berries, unwashed.