Sand in the coop - does the sand need to be completely changed periodically?

I am a soon to be new chicken keeper (although my wife has raised chickens before). After much research, I have decided to use a hybrid litter method - sand in the coop, deep litter in the run.

The first place I read about using sand (both in the coop and run, in this case) seemed to indicate that they get a couple of yards of sand delivered each year to put in the coop and run. However, they didn't explicitly say whether they remove the old sand and replace it with the new sand or just top off the sand level. I haven't come across anything else that implies that the sand needs to be changed out and I haven't read anything that says that the sand doesn't need to be changed out.

So how about it? Do you need to periodically need to remove the sand and replace it with new (like you do with a cat box)? Or do you just top off to account for losses?

Also, if you do need to remove the sand periodically, what on earth do you do with all of that sand???!!!

Thanks,

Ryan