I have sand in the run - and wood shavings in the coop.
I just put the sand into the run - been wanting to for awhile, but had to re-do a few things first. I have an 8x16 foot run and put in about a half ton of sand - it made it to be about 4 inches deep or so. I plan to add in another half ton in the spring after the rainy winter.
One thing which helped, is that I totaly covered the run. I had it half roofed, but half was open (with screen on top). I put the roof over the entire thing and it has stayed more dry and clean that way. I had dirt floor before - clay, actually, as our soil down here is very much clay. I have not gone through a winter with the full roof or the sand yet, but it HAS to be better than bare dirt/clay pummeled with downpouring rain. Talk about stink and mess !! It was like a Chicken Poo Slip and Slide last winter. (yuk). - we don't get much snow, but we get TONS of rain in the winter.
I am SO happy with the sand - it looks nicer, smells nicer, and is non-slip even when it does rain. The chickens seem to love it, too. My husband was sceptical about sand being such a big improvement - so I took the truck to town and got it myself, and spread it around myself, and when I was done, he went on and on for two days about how much better it was, LOL. I would have done a whole ton, but my truck is a half ton truck, and it is 12 miles to town - I didn't want to pay more in gas than I was paying for the sand, LOL.
A half ton of sand, near me, is about 17.00 - pretty cheap for the benefit is gives in the run. A Ton is only about 25 dollars - it is cheaper the more you buy at one time.
I have not had to rake it yet, but I bought a rake just for this purpose. It has been dry, lately, so it has been scratched in (I throw out grains, also) and I can usually not even see any poo in the run. Another benefit is the waterer is cleaner. I did put it up on a concrete slab, but I had that before the sand, and it didn't help much. (I also added some ACV to the water - the stuff is a *cheap* miracle working wonder, IMO). I also have banties in there, now, but they scratch and throw dirt as much as a bigger chicken does, LOL sometimes I think more so. The big chickens I moved to the "new" coop.
I would reccomend sand in the chicken run to anyone. I cannot go on enough about how much it improved my run.
ETA - I also sprinkle DE around the run. and I have about 20 banties in the run.
Peace -
Meriah