Ok, the mud is insane. I called and got a quote on pea gravel, but I wanted to ask about it first. Will it sink and settle and disappear in the ground over time? Will it smell as poo builds up under it? Can I hose the surface off for cleaning? Can I put down stall mats first, or will it cause an odor or other grossness under the mats? Or put down the gravel, then stall mats, and hose/pooperscoop the mats off? The chickens have taught me that wet sand sucks. The ducks are nothing but wet, so no sand for them. The run has a 6 inch lip around it of treated wood, so I was going to do the gravel 4 inches deep. According to my math, I need 2 tons to get 10x10 4 inches deep. The area doesn't drain that well, it's a clay base. We're getting a pump to handle water changes better, to get it scattered around the yard. The pool dumping combined with the rain, there is standing water everywhere around the duck run. They love it, I hate it. I already have a base of pine shavings in there, so that I can walk in there without getting too filthy. Can I leave it, or do I need to remove it before putting the gravel down? I was thinking that since it takes so long to break down, it would help support the gravel from sinking. The ducks have a "soft" layer going from all their beak sifting when water pools in there.