I have made a demand feeder out of pvc after reading about it in another post. That post talked about capping off the pvc and drilling half inch holes in it and attaching to a dock post and filling with food and they will eat the food out of the holes as it softens. I don't have a dock so I took a metal fence post and drove it into the pond bottom and secured my pvc to it with bungees. I have holes drilled in it for about the bottom 1.5 feet where it is underwater. The fish do eat all the food that initially makes its way down to the bottom of the tube. The problem I'm having is that the food gums up right at the water level and gets stuck and the rest of the food does not make its way down to the bottom to be eaten. Does anyone have any experience with this and have a solution or is my solution to submerse much more of the pvc and drill many more holes? Thanks!