Bridging is when the outlet is clogged by the the feed "getting stuck" in the outlet, nothing blocking it but the feed locking up. It is common in things like grain unloading, gumball machines geting clogged, etc. Especially in gumball machines, etc. the mixing of different sizes of product greatly reduces bridging. There aren't a lot of products where you can successfully mix sizes (corn & wheat????), but with fish food you can.

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