The run is almost 30 sq. feet, and I have five birds. They free range a good amount so the run is just kind of a stand in. Trust me, the sand is not in poor shape because it is overrun with chickens...it is in bad shape because rain, dirt, food, etc that has all accumulated in the sand has kind of gotten mixed in.
I understand that a lot of people have good luck with sand, and that is great to hear, but mine just hasnt worked. It is drained properly, it is plenty deep, it isn't bad sand. It was just not in the cards for me. Something like wood chips will work much better.
Also, for c2chicks - 12.5 sq feet per bird...really? Where did you get that number. This is a forum, so there are a ton of opinions (such as my opinion on sand). A lot of people say a lot of different things. In a residential area, a chicken palace cannot be built, so for five birds I can't have a compound. Trust me, these birds have more than enough room. Standards vary by what people say, but 12.5 sq feet per bird does not sound right. I'm sure you can link an article saying that 10 sq feet is the right size, but I can link one that says 5 sq feet of run space is appropriate. I have read a lot, and that is by far the highest estimate I have ever seen on this forum.
Sand usually works well, but you do have to maintain it. My run is 15x15, covered and has 6 inches of course sand in it. I rake it out every Saturday, getting rid of dried poop, excess food etc. I know a lot of people scoop it out like a kitty litter box, but I don't have time for that. Once a year I scrape out a couple inches and replace it with new sand. As for sq ft per bird, the answer has to do with the condition of the area. The more sq ft per bird you have, the cleaner it will stay. Nature can break down a certain amount of waste, but too much waste in too small an area leads to filthy conditions.
Let us know how the wood chips or dirt does. I had an uncovered dirt run, and it was fine in summer, but miserable in winter and spring. That's when I decided to put a roof over my run and close it in during the winter. Shoveling a coop run was not a task I enjoyed or had time for!