I'm nervous about going DLM. It just seems so unsanitary but then I look at how many people have been doing that for many, many years which tells me that it can't be all bad.
It's funny how people think differently. I did deep litter last winter in my small coop and loved it. Got the new, larger coop finished in the spring and put litter in the floor but put sand in the tray under the roosts. I also changed out the small coop from deep litter to sand [it was housing 6 new chicks before they went into the big coop]. I'd read so many good things about sand that I wanted to give it a try.
I got rid of all the sand in very short order because . . . it seemed unsanitary!
With the deep litter I could see that the poo was being impacted by something - microbes, critters, whatever - and was being literally eaten alive and disappearing into the litter. With the sand, the poo just sat there in gritty little clumps until I came with the kitty litter scoop and sifted it out, putting it all in a bucket. That bucket got real heavy in a matter of days and I had to then dump that stinking mess into my compost pile. And, it was a REALLY stinking mess, especially in the summer. Sand was a LOT more work for me compared to the deep litter.
I then began to wonder where the liquid portion of the poo was going. Even the best of chicken poops seeps liquid. Put a nice solid one in a plastic bag and you'll soon see poo-water collecting in the bottom of the bag. I'm thinking that poo water was just soaking down to the bottom of the sand and sitting there. After a few weeks the sand wasn't as pristine white as it had been. It didn't smell so great, either. Short of shoveling all that sand over so that any poo liquid that had soaked to the bottom could be brought to the top to dry, I didn't see any way to get rid of it or to clean it. So, I got rid of the sand.
That's just my experience and everyone is different but I do find it interesting that some are concerned about deep litter because they feel it unsanitary and yet some - at least me - don't like sand as they find it unsanitary. I'm thinking that chickens are just an unsanitary lot and we'll each have to deal with them the best we can!