At our barn we ride our manure into the arena and spread it out. Most boarders agree there has got to be a better way, we just haven't been able to convince the barn owner yet.
The biggest problems come from people not spreading out their piles properly which causes uneven patches and you can tell when you hit one while riding. The second problem somes when it rains, it turns into one big stinky, slippery mess.
About twice a year the arena gets scraped clean after which it is better for a while and then it's back to the same.
Has anyone come up with the perfect solution at their barn?