Here are the buckets we are going to use 15g drum feeder and 5g feeder. The 15 gallon feeder holds 75 pounds of feed and the 5 g holds 25 pounds. This for our flock of 25 and we are hoping it means we fill the feeders every 3-4 weeks, instead of daily. If needed will add extension to end of pvc if too much feed gets flicked out, we also have end caps for pvc pieces to cover to keep out rodents.