We have had chickens since about april and have been through a vast learning curve with regards to what to put in there run, we had just the soil..No Good at all, when it rained was like a mud bath, we then tried putting gravel down, great at first but then as i hosed it down over a matter of months the hens poop wasnt wshing away great and smelled. So then we decided Sharp Sand from the buiders yard. We dug out all the soil and got a huge builders bag of sand (1 ton i think) and poured the whole lot in the run..its been Amazing!!!! so much better, and cleaner. All i do while they are having there hour free running in the garden is lightly rake the top and put in the bin. takes 1 minute to do. Fantastic. .