If you use pro boxes be sure to look (not just feel) underneath the pro box before dumping into a tender or directly into the CCS. Chrushed limestone rock will lodge up into the honeycomb structured plastic on the bottom. Then when you beat on the side of the pro box with your hand to get the last few beans or corn out a rock that was stuck up in those squares will fall down into the hopper. The squares are a perfect size to hold a rock that will block one of the runs of the CCS. Then you either get to dump that side of the CCS to get the rock out or fight it as it plugs up several times after using a wire through the hose opening to move the rock around so you can plant the box out.

Very important tip - when you finally get the box planted down and dump the remaing few gallons out into a 5 gallon bucket, dont dump the bucket into the other hopper without screening the seed - don't ask me how we know.

John