I am wanting to easily harvest my chickens poop for my compost pile. Right now the flooring in my run is natural dead grass and when I go to clean the run my rake gets stuck in the dead grass roots. The base of my run is a 2x6 so I was thinking of filling it with sand, saw dust, pine chips or something I could rake and skim easily. What is the best material for this? Any advice would be greatly appriciated.