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I did have this problem. It turned out my husband had glued, but no caulked each of the PVC joints. The caulk made a huge difference. The smallest moisture will cause food to clump up. Hope this helps.

I love the half cap idea! We wrapped ours with black electrical tape to make the opening smaller. So far, they don't pick at the tape. We solved our clumping (damp) food issue. Although he had glued the fittings, it turned out he didn't silicone caulk the exterior of the seams. No problems...

we used this design but the food keeps getting damp and stuck in the elbow. Does this happen to anyone else? I can't figure out how it's happening? Could it be from them breathing in the tube?