I use the ground for my sows and self feeders for my growers. I do have some of that piple laying around except it is black with albue stripe through it. A chain saw is a wonderful thing when it comes to cutting these pipes in half. I dont bother filling in the ends just leave them open. I do find they are rather heavy though to lift and clean out.
self feeders can be filled with the mill and tractor and tha means I can put 300 or 500 kg or even a 1000 kg out in one hit and it wil last all week depending on the number in the pen.